Jin-Yi Yu: Beginning from his class we're going to going around the low pressure system to describe the severe weather phenomena associate with the extra tropical cycle, as I mentioned previously, the.
Jin-Yi Yu: weather pattern around the tropical cycle concentrate on three areas, one is to a north of the one from here, and the other is to the south.
Jin-Yi Yu: America nearly cold front and then the third part is there's a pleaser condition around the northwestern corner of the.
Jin-Yi Yu: Low pressure system, so we are going to be coming from Chapter three are we are going to describe the weather phenomena or extreme weather phenomena associated with the focus icon beginning from here, nearly one from so we're going to describe all these would have in me.
Jin-Yi Yu: To the nose ahead on this one fun.
Jin-Yi Yu: On front.
Jin-Yi Yu: And this one is what we call the cold type.
Jin-Yi Yu: of severe weather and that's where we're going to pick either disquiet here in Chapel hill we're talking about freezing precipitation.
Jin-Yi Yu: And I stopped so i'll tell you that in in funnel one far we expect to see of freezing weather phenomena or ice storm and this chapter 12 and then, when this.
Jin-Yi Yu: storm passes through the United States and move to the New England area.
Jin-Yi Yu: When notice that the Minister for example moodle here.
Jin-Yi Yu: And me adequate region, and then we see that in this region we're going to see another very interesting severe weather phenomena as call the late effects, most of most the snowstorm associated with the.
Jin-Yi Yu: Extra tropical cycle when it's done but, as this storm is produced specifically around this query region as Chapter 13 we're going to talk about lake effect snow storm.
Jin-Yi Yu: And then, after that we're going to moto we could continue moving around counterclockwise chapter certain the first snowstorm here then we're going to talk about this area chapter 14 we're going to talk about the appraiser condition.
Jin-Yi Yu: This area to Northwest how this cycle, we have co a coming down from the north, together with the motion coming in from this side and then they're going to meet each other to produce a pleaser condition in the north west corner of the side corner, as our chapter 14.
Jin-Yi Yu: And then, this area because it usually happen around.
Jin-Yi Yu: near the east of the rocky mountain so after chapter 14 chapter 15 we're going to talk about the Cobra call.
Jin-Yi Yu: search in phenomena that often happen along the eastern side of rocky mountain service Ko Ko wave.
Jin-Yi Yu: And then, since we are talking about this call every little mountain, they will continue to talk about mountain snow.
Jin-Yi Yu: stone.
Jin-Yi Yu: And the chapter 17 will be mountain wind storm Okay, and that will be this topic that we're going to discuss this week or property for the next week we're going around from one from.
Jin-Yi Yu: Whether to the northwestern corner weather in the related mountainside weather and then in week nine we're going to go to click edit wi fi you're going to.
Jin-Yi Yu: want to associate with co fact that's the basic idea, so now let's come back to.
Jin-Yi Yu: This chapter, we wonder phenomena associated with the one friend of the extra tropical cycle so basically, as you can see the title we're going to talk about.
Jin-Yi Yu: phenomena weather phenomena relate to freezing precipitation so in here, the freezing precipitation there's two key words first is precipitation second this precipitation is is has a temperature below zero degrees see that's why it's called freezing.
Jin-Yi Yu: Freezing precipitation So here we need to get a first he can idea about how can we produce freezing precipitation and why this phenomena is so specifically related to be one from.
Jin-Yi Yu: Part of the.
Jin-Yi Yu: Extra tropical cycle okay so we're talking about why is this freezing precipitation usually happen associated with the with this icon there and then, in order to explain this.
Jin-Yi Yu: Freezing presentation their support apple freezing precipitation including is when a freezing rain.
Jin-Yi Yu: ice planet.
Jin-Yi Yu: snow so there's three different type of freezing precipitation will explain why to a nose or a header one firm what we can see this sequence of three type of freezing Presbyterian happen in particular order and not has to do with the vertical structure of this atmosphere, the temperature.
Jin-Yi Yu: read it, I mean by media one front area so let's continue on this chapter, as I say, anytime became loose definition and then chicken, what is the definition of.
Jin-Yi Yu: What a phenomenal we focus on that chapter and then we'll talk about the physical process behind that we don't phenomena in the surprise, what are the typical weather pattern.
Jin-Yi Yu: That can produce this particular weather phenomena so again we're going to go through these three elements for the chapter 12 okay so.
Jin-Yi Yu: Basically, this is what I already told you, the freezing precipitation typically happen ahead of one from.
Jin-Yi Yu: associate with the windows icon and, as you can see here the there is a particular sequence or freezing weather phenomena can happen.
Jin-Yi Yu: From a military to the north of the one from to further away wow if i'm the one for so we can see that they close the one from work on a seizure in and then became the sea freezing rain it we're going to see ice product and then eventually going to see snow.
Jin-Yi Yu: And we have want to.
Jin-Yi Yu: express what are the physical process that can produce these different types of precipitation.
Jin-Yi Yu: In, in fact, not to the north of the one from.
Jin-Yi Yu: So remember these chapters try to describe this big shading area those calories kind of potatoes or is freezing precipitation in that particular order.
Jin-Yi Yu: So first last and final part is the freezing precipitation so freezing precipitation is run or play soccer so so paying attention in this chapter priests phrasing precipitation renae to.
Jin-Yi Yu: Extra topical cycle.
Jin-Yi Yu: Well it's one fun.
Jin-Yi Yu: is related to this.
Jin-Yi Yu: room for further on surface in need to a department or an ice grace.
Jin-Yi Yu: Freezing precipitation another type of freezing precision that this chapter want to emphasize is Patricia at first.
Jin-Yi Yu: It is not in a formal rain is in the form of tree so small.
Jin-Yi Yu: block the POP particle and that suspended in the sky or in part of it must be an airplane flying into this freeze cancel area, the air print ministry so have.
Jin-Yi Yu: My contact on the airplane service then will produce another type of freezing precipitation That is very kind of yours and important to aviation NASA second part of the.
Jin-Yi Yu: Freezing precipitation you're going to talk about a second rope of freezing precipitation we're going to talk about so we're going to mostly focus on freezing precipitation during.
Jin-Yi Yu: A rain, the car frozen and surface in Detroit is grace and, at the very end we're going to briefly talk about this friends in persuasion costs by clue so near the surface associated with low crowd and the cost per passenger to aviation.
Jin-Yi Yu: Okay now completing our definition freelancing precipitation is responsible for about 20% of all winter weather related injury right is because a lot of these.
Jin-Yi Yu: Planning presentation was appear us practice because cut frozen on unresolved and a highway on the street, and that will cause the traffic accident in freezing precipitation occur in about a force or all winter weather event in the continental us, so this is a very common.
Jin-Yi Yu: way to work on the opposite the winter winter time.
Jin-Yi Yu: And then, a plan this pre freezing precipitation has.
Jin-Yi Yu: A member of accumulation for a list 0.5 inches, then the freezing precision event is going to be qualify identify those ice stop so I stone is a freezing presentation when it produce at least 2.5 0.25 inches of.
Jin-Yi Yu: ice.
Jin-Yi Yu: tea and half water freezing precipitation even call it right, as I stop Okay, so this the last.
Jin-Yi Yu: The second per last statement is just try to find a party is ice storm.
Jin-Yi Yu: And the first step is to define what is freezing perspiration, as I say, we should always first when we talk about any other phenomena we need to clearly.
Jin-Yi Yu: Remember Also, what is the definition of that word phenomena okay now since we're talking about franchising priests rotation then that's a real quickly.
Jin-Yi Yu: about what is a precision and how to produce precipitation.
Jin-Yi Yu: You already have.
Jin-Yi Yu: This.
Jin-Yi Yu: process or.
Jin-Yi Yu: The process, yes 55 you'll probably already learn how to produce produce produce more quickly consumers one.
Jin-Yi Yu: Excuse me.
Jin-Yi Yu: The beast and next slide just try to tell you.
Jin-Yi Yu: condensation alone cannot produce presentation or pleasing presentation we need locally, I something like that to produce brain or produce ice other that's a key thing we want to say.
Jin-Yi Yu: And also want to you.
Jin-Yi Yu: know, let me rephrase it the cleansing, we are going to talk about in this the physical process that we're going to talk about here.
Jin-Yi Yu: is trying to explain how precipitation can produce to become big enough either as a drain or his eyes could become big enough heavy enough for them to the crowd Okay, because precipitation is any liquid all sorry water particle that falls from the most fear and Mitch, the club.
Jin-Yi Yu: So that's a key issue of trust in the coming few slides, how can we make a presentation as kyra on paper cup contains in the sky, how can we wind up Walker of property or ice political forum down all the way to the ground.
Jin-Yi Yu: So, here it is, of course, we know that water vapor has to get saturated in.
Jin-Yi Yu: In order to produce a.
Jin-Yi Yu: lot of property right and why usually these Walker proper you know if I must be because surgery in the sky because remember.
Jin-Yi Yu: So we say when a Co op expand expand the site that is volume when you expand the volume, the first or similar dynamic tell.
Jin-Yi Yu: me to use his kinetic energy to push the air to become bigger and when the air could use his kinetic energy, which means is speed.
Jin-Yi Yu: to convert the kinetic energy to potential energy to push the problem, the air passive get bigger, then the mo color lost his velocity which means he lost his kinetic energy, which means that air become have a lower temperature when the.
Jin-Yi Yu: temperature when a Co op, then the maximum amount of water vapor an air can know becomes smaller and smaller and smaller so that's why we have a we have a seminar where we put in a surface, but on air co op up when a service that same amount, a lot of Labor.
Jin-Yi Yu: costs will reach us at saturation yet right and then, when it.
Jin-Yi Yu: caught up in the sky image a cool down in the maximum.
Jin-Yi Yu: saturate water vapor among reduce and to one point, the amount of people, we have become a saturated water vapor and so water vapor such a way in a Skype.
Jin-Yi Yu: And now we need to when when we need to have a chronically I, so we need to have it also air pollution or task in the sky, so that.
Jin-Yi Yu: People can easily condensation around all those particle which we call our inquiry I realize I won the lottery cover into water is very difficult if there's not any korea's nuclear.
Jin-Yi Yu: But even if we have called in Korea, because most of us calling in Korea very, very small particle suspended in the atmosphere.
Jin-Yi Yu: So the car proper form around a crowd in Korea is still based and we're very tiny so Kenny, that they are not heavy enough to against the when, for example, I pushed a Co op or what we call abstract.
Jin-Yi Yu: Or the rising air so.
Jin-Yi Yu: This initial crown property is too small for them to the camp, so he cannot become precipitation so the next few slides it in is trying to explain how can we make this Walker corporate to become two grand for small particle to pick particle in order to kind of heavier known for them.
Jin-Yi Yu: And also, how can you make the ice.
Jin-Yi Yu: ice crystal suspect in the sky to become heavy a big enough, the fourth column to become snow so Those are two different.
Jin-Yi Yu: series of physical process involved to make water droplet to become big enough to fall down and to make ice crystal to compete for them.
Jin-Yi Yu: They are two different process which i'm going to quickly go through, because I predict yes 55 already talked about that so here it tells you that even if we have ice call nuclei and the vapor contains around this crowd and then we kind of crowd Tropic.
Jin-Yi Yu: In this cold water droplet typical size is, as has a radius of TIM my COMP because here the radius is in Union or Michael meter.
Jin-Yi Yu: Which is 10 to the minus six meter.
Jin-Yi Yu: So you can see that the image will drop it, I will produce in the sky through the conversation around nuclei as tend to 10 mile.
Jin-Yi Yu: radius but in order to be happy or not before them put a clamp we find out about the typical raindrop it is has a radius of when saw was in my community.
Jin-Yi Yu: that the initial droplet we forms, with a conversation.
Jin-Yi Yu: need to grow from 10 meter radius in radius to 1000 micrometres in radius, which means the radius has to increase by 100 time and tell us the cupid one so Henry is one meaning time manager, we need to have one meanings of this card droplet.
Jin-Yi Yu: To form this all the cloud has to grow where means time in order to have a size and weight that is heavy enough to for them to acquire and which is very difficult if we rely on this.
Jin-Yi Yu: Water droplets to first formal one topic and then continue to come in and say around this water dropping comments around Rafa dropping comes.
Jin-Yi Yu: comes condensate and this one or two of empirical one mean his time speaker that's basically like difficult so compensation around.
Jin-Yi Yu: About condensation nuclei initially for muscle car drop it and those canonization process is insufficient to generate.
Jin-Yi Yu: The mercury car trying to compete enough to become rent dropped into for them right, so we need to.
Jin-Yi Yu: But we still have room for produce very often for a reason and I lose me is there is a process called correlation called the yeses process, so you need to have coalition first and then has core the essence and all together stories, cognition Korean says process.
Jin-Yi Yu: we're gonna make this run chocolate hot chocolate.
Jin-Yi Yu: to become big enough to become rain dropper.
Jin-Yi Yu: And two photon to produce read and we're going to be so now, this is a collision course the essence is the process to make.
Jin-Yi Yu: property to become big enough one topic to become red border, can we talk about the piano process corporate urine process which is called ice particle.
Jin-Yi Yu: From a small eyes particle to become.
Jin-Yi Yu: snow article and for them to the question becomes okay that's another process we're going to talk about later let's talk about is dropping the process of make water droplet become big enough.
In.
Jin-Yi Yu: The sciences called correlation called the essence process or clinical so quickly, because this is going to produce a ring.
Jin-Yi Yu: This is not what we care we care more about eyes, which is going to be something we call here furniture and process Okay, and our produce big eyes, and that is where it's going to be important for all these weird phenomena we're going to talk about.
Jin-Yi Yu: near the.
Jin-Yi Yu: near one from here.
Jin-Yi Yu: So we need to talk about our eyes particle park Okay, but in order to appeal this concept, I want to begin with a lot of water.
Jin-Yi Yu: Okay, now, so what happened is now you have in the sky your phone a curl inside a call you have this wonderful proper, how can we make.
Jin-Yi Yu: The the office inside a copy lot of traffic that means this cow.
Jin-Yi Yu: Max has a temperature warmer than zero decreasing okay so we're talking about the COP has a temperature woman is zero degree see that's Why would you put this conversation all these condensation result in water droplets and these kind of cow was called temperature.
Jin-Yi Yu: slaughter whole camp will not, as we see with call this car one car, I want you to remember this terminology Okay, because when we talk about these freezing precipitation associated with one from we're going to talk about.
Jin-Yi Yu: An alpha beta cuckoo cuckoo cuckoo means that in the partner zero degree see exists.
Jin-Yi Yu: Somewhere in the lower part of the club so below this the National Park our cars or more than zero, we see a rabbit is faster to decrease, so if conversation happened here is going to produce eyes.
Jin-Yi Yu: up on the top of a cow in currency happen on a dog park the car is going to produce what water droplet okay and that's called coop clown and the crab crab obviously in the whole car has a temperature below zero degrees see anyways.
Jin-Yi Yu: is less than zero degrees see then this whole crowd is called Coco to me when it comes to happen we're gonna have.
Jin-Yi Yu: ice cream okay we're gonna go to a park so now let's talk about the topic in the World Cup so we're gonna have such this, so now we we are here.
Jin-Yi Yu: Standing here, and this call here and the cotton virtuous woman is equal, you see, so he webinar parties come up conversation we have.
Jin-Yi Yu: This.
Jin-Yi Yu: happen to my him.
Jin-Yi Yu: just a minute.
Jin-Yi Yu: Just many, many gifts, let me pause the.
Jin-Yi Yu: Video for a moment.
Jin-Yi Yu: Okay i'm back, so now we are.
Jin-Yi Yu: We are the one.
Jin-Yi Yu: And then we see a one crowdfunding here so.
Jin-Yi Yu: We have another topic won a trophy and madden say family here we have a drop it as money and profit and small to operate and what happened is these.
Jin-Yi Yu: Capital is going to fall upon faster than this small traffic, because the the timing of velocity the vast the obvious one or travis has is really to his size, the articles that will have a call that the the fast the 14th through the sky, so they are in different speeds, so this.
Jin-Yi Yu: is called corner drop drop rate and this collect the topic well.
Jin-Yi Yu: We smaller topic on his past and he will compress a nice these foreign property, so this comparison is push that.
Jin-Yi Yu: away and most.
Jin-Yi Yu: Top is going to be easy to push your way so as a result on this only this slideshow or moderate sized total traffic will remain stay underpass so this big drop is going to collide with these other people traveling.
Jin-Yi Yu: So there's an inverse relationship between a collector drop size in the collision if collision efficiency coalition typically occur between a collector.
Jin-Yi Yu: And 30 gotcha cow a truck droplet small puppet are pushed the site so collision is more effective for the Tropic that our library much smarter than a collect to operate so now, this first process happening is corporation, and then, when these 200 capital.
Jin-Yi Yu: Correct we'll find out, they tend to stick stick together, which we call audiences right well when collision occur.
Jin-Yi Yu: Either fans or pop or curious into one larger drop and curiosity efficient is these find out to be is nothing but a very high for most or this water top indicator most of collision will result in Korea says so correlation and Korea, since poli Shin.
Jin-Yi Yu: cody is so this process.
Jin-Yi Yu: He is the key primary mechanism for precipitation to firm in the World Cup so for crowd in the tropical region, where we have one car because inside the whole car we have another P, or lack of proper.
Jin-Yi Yu: So this is a collision courses process for one cow now let's see how snow and ice form to become bigger for two o'clock Okay, then now I need to talk about the the other process which we call the budgeting process.
Jin-Yi Yu: For Belgium and process to happening these processes choir to sing co exist inside that crowd unique up ice crystal second you need to have a super cool.
Jin-Yi Yu: Water so you need to have water droplet together we society is particle.
Jin-Yi Yu: inside a cop, so you might be good for us situation and this one has to be super cool so that's explain what it, what does it mean as a super cool water to operate.
Jin-Yi Yu: So.
Jin-Yi Yu: that's first recognized or understand why is super cool water water ice will mail it a zero to queasy so when temperature goes up above the adequacy for sure I saw a male become water.
Jin-Yi Yu: temperature drop below zero degrees he.
Jin-Yi Yu: does not necessarily freeze to eyes at the zero decreasing right, you may have ice nuclei in order to help water, the CAP CAP frozen.
Jin-Yi Yu: Right and what else is in Korea soccer microscopic particles, such as clay organic particle or bacteria have a crystal structure senior two eyes, then they will allow all those political will allow Blocker molecules are cash to and to peel an ice ice crystal.
Jin-Yi Yu: Is new career if we are very, very clean atmosphere, no pollution know Assad political also in the sky, then what is very difficult to cut frozen and in that situation we find out a waffle can exist, even if his temperature is already dropped below zero frequency, as well as the.
Jin-Yi Yu: temperature is between.
Jin-Yi Yu: The quincy to actually should be here minus do the greasy.
Jin-Yi Yu: Let me clean up here.
Jin-Yi Yu: It the proper temperature is between 40 degrees C minus wanted equations your degree see than it is possible to have water still in liquid form.
Jin-Yi Yu: Without got frozen and matt is called super cool water, I mean his temperature is below zero but he's still in the liquid form so equal to minus 40 degrees he.
Jin-Yi Yu: He temperatures drop, even though minus 40 degrees then water will become frozen ice so super cool water can resolve in freezing perspiration when they come in.
Jin-Yi Yu: Contact with the surface, not as temperature 00 degrees, he will come for this part data, so this is the key spirit by we're going to discuss to.
Jin-Yi Yu: increase patient and sort of water that perspective when it comes to the cramp.
Jin-Yi Yu: Before he took one is still in liquid form but equal shall call his temperature period between 02 minus 40 degrees as soon as he he the surface, he got frozen and become freezing persuasion.
Jin-Yi Yu: But let's not talk about a year just talk about how can we call small eyes into a PIC eyes to fall from cow into the Crown.
Jin-Yi Yu: So.
Jin-Yi Yu: experiment is click on coke out so i'm not going to explain that, but basically when cow has a temperature.
Jin-Yi Yu: Because you know decrease, either through the whole cow below zero degrees.
Jin-Yi Yu: For the cow cow or part of a purple cow has a temperature 00 to receive a phone call a cooker in either case inside his to Cabo cook have a cow inside him we have slicing mixed together one is, we have our product mix together what one we have liquid water.
Jin-Yi Yu: that's a freezing and super cool water and ice particle yeah so you be you are in the so you are this reason coexistence, then this is particularly if you have super cool water and ice cream existence of is a super cool water is critical to the creation of.
Jin-Yi Yu: furniture furniture and process Okay, so this passage is very easy to understand.
Jin-Yi Yu: Basically, is how we show on the inside of the figure, so you say a coo coo car car car your eyes to kill it was super cool water droplet and because the saturation water pressure of ice is last, then the saturation vapor pressure for super cool water and water vapor Okay, so when I.
Jin-Yi Yu: hear choppy all a super cool weather here.
Jin-Yi Yu: We have a very low pressure to learn is not saturated saturated yet, but the.
Jin-Yi Yu: amount in the air is already.
Jin-Yi Yu: This situation for ice, so all these people will the local directory evaporate from.
Jin-Yi Yu: This this was the top, it was one of the founders water flapping and not directly from our eyes water to us 30.
Jin-Yi Yu: And the reason this process happening is, as we say here the saturation water vapor pressure for ice and for whatever topic at different okay.
Jin-Yi Yu: So tell me when I call back is this together ice and other is this stuff here.
Jin-Yi Yu: will change directly into ice so as we see here the water molecules are come out from this water to operate and then to attach into this ice crystal MC as critical pika pika.
Jin-Yi Yu: Added expense all making this water drop it becomes smaller and smaller, so this passage is called Belgium process so john process can happen.
Jin-Yi Yu: If you have Walker and ice cream ecosystem and that can only happen in a Coco Coco and crystal grew up with very expensive super cold traffic and ice cream scope become heavy another, for then when this is.
Jin-Yi Yu: plan for falling down what happened is that two pieces as well stick together right or we will continue to to produce.
Jin-Yi Yu: More.
Jin-Yi Yu: conversation around this is perfect, I thought was karima process or two piece of ice.
Jin-Yi Yu: Correct in a stick to each other that's called application okay.
Jin-Yi Yu: This.
Jin-Yi Yu: Call existence of ice and ice.
Jin-Yi Yu: cold ice and water vapor.
Jin-Yi Yu: Is Chris Chris overgrow they're looking for water droplet, then this is falling down when he produced the naming an African women application and he's to process together.
Jin-Yi Yu: Oil make the eyes become very big and for into the color to become a snow so that's the basic what i'm trying to tell you is how can we produce.
Jin-Yi Yu: smoke.
Jin-Yi Yu: From coo and co calm in that physical process co production process virgin process includes three step first saturation directly from fun.
Jin-Yi Yu: To eyes first pass second in the 40s well, I mean or application and then become speaker now that's all I want to say okay now let's come to the freezing precipitation how.
Jin-Yi Yu: To.
Jin-Yi Yu: Explain it will produce freezing precision in particular sequence gran freezing when ice and snow to the north of the one from okay so explain why this particular sequence happen, so the particular sequel is showing here.
Jin-Yi Yu: Let me go back to the very beginning here, you can see here.
Jin-Yi Yu: Those are typical.
Jin-Yi Yu: Presentation type.
Jin-Yi Yu: I put on us i've.
Jin-Yi Yu: known from right, so what is that comes up the freaking prospecting concept that explain why it happened Okay, so we show here first you produce rain.
Jin-Yi Yu: Then second freezing rain than ice pattern for the way produce enough so nice experience right we have this particular sequence of.
Jin-Yi Yu: precipitation pattern, and that is can be easily understood here by Scott from for themselves over these own from and then pass this one, find the Korean to the to the mouse or coffee shop in the south of here, Nicole phrase here.
Jin-Yi Yu: Is the call his own from over is this part is pragmatic yep.
Jin-Yi Yu: Okay.
Jin-Yi Yu: And this year here, so this is here.
Jin-Yi Yu: is still inside a woman, so we have warm air here so here is marine tropical warm air hey here is continental partner mass right, so your mind tropical year mass move for hot oversee this part, these are all those marine.
Jin-Yi Yu: Tropical one here are the national fine.
Jin-Yi Yu: couple mystical the moon also want to approach this coin coin is heavier so this woman when they meet each other, they want me to become how over go above this career Okay, let me create this picture that's right, this is where surface one one from this him.
Jin-Yi Yu: Okay, then seeing, there is a this Green is the deal degree temperature, so we have all those warm air, which is temperature warmer than zero degrees C.
Jin-Yi Yu: And then, of course, will go up in the sky, the temperature drops below zero degrees, you know, neither here or here any location, we go higher and higher temperature dropped below zero degrees he.
Jin-Yi Yu: Is that we also has this very cold temperature zero degrees service, because this is the continental parameters, so this is now installed, it was clear decreasing.
Jin-Yi Yu: decreasing and the bathroom that's what you produce these people have a freezing precipitation okay now that's convenient.
Jin-Yi Yu: So now let's talk about play here, there is completely in the meantime tropical Ms warm here, so you see that.
Jin-Yi Yu: This nine here we have.
Jin-Yi Yu: One more intimate oh my God quincy woman is equal.
Jin-Yi Yu: to one another, it becomes pathogenic we see here right, so this is the adequacy here is proposed a So you can see that mirror surface.
Jin-Yi Yu: temperatures greater than zero degrees here on the right hand side of the discussion passion, I so is one temperature and other kinds of the beast nine is cold temperature Okay, and this is zero degree see here.
Jin-Yi Yu: Okay, so I see.
Jin-Yi Yu: It.
Jin-Yi Yu: precipitation produce high in the sky, because very co might limit your topic, and then you become is falling down falling down falling down into this very topical warm am Ms right, then you will now become.
Jin-Yi Yu: Spread that's this Britta proctor is a read that and then you're going to surface that's why first me this when are we going to put this room okay that's where we show here.
Jin-Yi Yu: Very close to.
Jin-Yi Yu: MIT media, the one from we're going to have a chance to produce read just completely water okay now as a mo further to the last into the one from there, we can see that a plan B is already here come on now, so we come from and he's already completed.
Jin-Yi Yu: near the surface part years has a lot of Korea and one man in the moon tropical woman is about is about right about nearly one kilometer to talk in America, so he can see that for probably be here.
Jin-Yi Yu: It is lumbers only.
Jin-Yi Yu: discretionary zero we see so one is only located.
Jin-Yi Yu: Between back to one one kilometer all the way to Canada.
Jin-Yi Yu: And most importantly know is that Nina stop is near the surface there's a berry shadow.
Jin-Yi Yu: that's temperature pillows etc, so now we put these high in the sky, who put their snow and snow falling down So these are coming from marine tropical one mayor this again as a point A email into.
Jin-Yi Yu: Right.
Jin-Yi Yu: Before I hit the surface is about higher for a few Henry maintenance of berry berry Korean here service right and make these become super cool water and it's super cool.
Jin-Yi Yu: It hasn't got frozen is actually issue, it can fold and it doesn't have our free food in Korea, so it doesn't have any tasks or any sense of to cut off from is around so that's why it's super cool and the service.
Jin-Yi Yu: Service has allowed us so so yeah two three when these trooper coladas surface surface reform from ice hey that's why I will put us in freezing.
Jin-Yi Yu: Freezing here let's look at this picture is a freezing read all these Brock area here and pick one.
Jin-Yi Yu: Because her nice rather drop it to the clump the water will spread into everywhere and a frozen for comma pick one or is black color here.
Jin-Yi Yu: In a couple of these these one is called as part of.
Jin-Yi Yu: This one is more individual ice, and on top of his pick one product guys have to pick, one that has the freezing rain, now we talk about here okay.
Jin-Yi Yu: here.
Jin-Yi Yu: We go further to announce to see obviously now the points he has even people they are caught caught here, so now.
Jin-Yi Yu: Again, we have only been a shadow.
Jin-Yi Yu: or a woman laughing baby thing.
Jin-Yi Yu: The.
Jin-Yi Yu: Air coming from marine hi tropical area and Nina surveys, we have around or co heir.
Jin-Yi Yu: The coil is not very deep.
Jin-Yi Yu: yeah so again, if you will, from any snow and it's not wearing them, so this very show up on woman in a male into water, and when you come down, so these people they're all.
Jin-Yi Yu: very, very cold temperature these rapper many referrals and back to ice and then come to surface pro for us with policy.
Jin-Yi Yu: snail mail completely in this shadow inversion they're here, because now we are very small, they are one one now and in completed mail, so you will refreeze in the near service there and become a eisley of it as a frozen raindrops on a surface master power show here.
Jin-Yi Yu: This is part of again similar.
Jin-Yi Yu: To the nose, then obviously upon P is so far away from this one one fundraise not a lot, so you don't have any summer today, so this C to.
Jin-Yi Yu: B and C, they have a sandwich structure which they are very, very cold in Virginia, so it was called inversion now a service called the.
Jin-Yi Yu: EPA has called immersion and the emerging topeka right, and then we come to a party, this is the temperature company just decrease, who is who is high, was added a similar to point a but he is we have very large woman that's why a.
Jin-Yi Yu: lot of green, but in a punk he further away is completed or below zero degrees C, so you have I know from higher up in the sky was falling down through this commando for me, I still call so that will continue coming to service become familiar that.
Jin-Yi Yu: The key power of this chapter is to understand these use this for point to explain it will produce rain freezing rain ice padded and smoke.
Jin-Yi Yu: And that can be also a sprint based on these.
Jin-Yi Yu: Four picture this picture actually similar to the what I still here but TV or more corresponding picture, for example, a point eight or this is form here.
Jin-Yi Yu: What he calls soon is for mayor here in become read and for me.
Jin-Yi Yu: Being here right so now.
Jin-Yi Yu: He has ice for foreign foreign service warm air and become rain, but before it hits the ground, he has co a again and that's why I could become freezing and then, when you.
Jin-Yi Yu: Get deeper a woman gets shallow, then you put this.
Jin-Yi Yu: Is Patrick Cote of street they are sensing is Pelosi and one is completely cold as produce small risk point D OK so i'm going to call or that you study this Tuesday together.
Jin-Yi Yu: And that's the way to the east of the cycle as a region or car the rap and laws are on fire and then associate with this this so if we are here, we are driving a car.
Jin-Yi Yu: From a lost power, the south or north to the south, which driving car coming down here we're driving a car here, and then we have one front back here.
Jin-Yi Yu: And he is pointing a only P E C and D, so you know ready we're going to see, though car and a sticker sticker car and then middle cow.
Jin-Yi Yu: stigma and very high car very thing so in Cabo Cabo when approaching from enough power to power, the one form we're going to see thing high middle car and very tall Emma seca Rocha in a Sunday we're going to experience what we experienced snow here.
Jin-Yi Yu: amen.
Jin-Yi Yu: After the season oh you're going to be careful because we're going to see become ice street or ice patent year.
Jin-Yi Yu: right because suddenly become that and then we can even close to this, these are waiting for approval can see one from Okay, see the car truck they become very low and very secret that we know near this area is that can we can have black eyes.
Jin-Yi Yu: right because can have freezing rain so that's a that's a partner, you need to be very careful when you're driving approaching Cairo won't find it now let's continue.
Jin-Yi Yu: corps and put the power, the vr type of the.
Jin-Yi Yu: filming pistachios cope fans in terms of pulling the freezing freezing freezing trees or means that see, we have a.
Jin-Yi Yu: tree so is that misty police station that freeze on contact we surface often form in coal cow Coco means we still need to have a cartoon but Shapiro show a whole crowd is below zero degrees see.
Jin-Yi Yu: This temperature is around the two minus 10 of so.
Jin-Yi Yu: How temperature.
Jin-Yi Yu: between zero to 10 degrees C minus 10 degrees see.
Jin-Yi Yu: It is a statement because nobody the super cool artwork and forth between 02 minus 40 degrees see So here we see Okay, we have another super cool factor that didn't form, and they are in Palo Alto they associate with adult cow.
Jin-Yi Yu: And then, it is a day usually.
Jin-Yi Yu: Then, when is this a bit low car and then, when the airplane flying through these BlackRock is going to produce other tasks on the airplane body and almost everybody is allow these super cool least tree so to.
Jin-Yi Yu: frozen become ice right and because of so in this case you're producing.
Jin-Yi Yu: This is called freezing drizzle and freezing freezing because happened to low crowd noise, though, because color temperature is not super cool, the higher the car the colder.
Jin-Yi Yu: temperature so here is low cost low temperatures is is is not very cold it's cold enough perform the.
Jin-Yi Yu: To produce providing super cool water and then because he's not cause, not a high score air prank unifying so this additive in there, they have one more cup frozen because of is facing persecution up until two freezing drizzle.
Jin-Yi Yu: And it because our venture icing ideation frequently pay particular attention to situation where freezing Theresa may occur okay so So what is this.
Jin-Yi Yu: person, we want to know in what kind of weather pattern, we are expecting to see freezing rain or freezing precipitation.
Jin-Yi Yu: Okay, so our last part is is trying to tell you what is the typical weather pattern green a to freezing precision so here the textbook carrier for.
Jin-Yi Yu: situation for typical where a parent can produce freezing precipitation and then, if you ask even before you read a textbook right if I say good job is for.
Jin-Yi Yu: Over the map, or whatever is going to produce freezing precipitation or poverty or materials, this one, and this one right.
Jin-Yi Yu: Right, because these two are the extra tropical cycle, who knows, Tom and we know already beginning of this chapter to the mouse of this own fun we're going to produce freezing perspective to the north of this one for run from organic produce freezing perspective so of course that.
Jin-Yi Yu: Situation P situation see is a psycho psycho.
Jin-Yi Yu: Over cycle, they are going to produce the freezing presentation so PNC Now I will run from please Oh, we thought the high pressure here.
Jin-Yi Yu: So he just have a windows icon right in to the loss of his own for windows icon and to a mouse on his own together there's another high pressure to us right that's what.
Jin-Yi Yu: I say in this slide PSC is most all a one from with or without without a high pressure to the north them, they are typical order to produce freezing.
Jin-Yi Yu: and had a typo what it is, is not that obvious that will produce freezing Pennsylvania, we can see that the key to decide whether or not you have to do is look at this time, good night Tata Tata night is the zeal decreasing night but i'm a service that's called back to look at this slide.
Jin-Yi Yu: You can see, we also need a surface, this is one front for loss of the the zero degrees here converge on a survey is to the loss of this.
Jin-Yi Yu: One from somewhere here, this one is where temperature pickin air temperature begins to drop below zero degrees see on the surface it or service right and that's where we're going to begin to see freezing precipitation of it, so now.
Jin-Yi Yu: I can put this in freezing potential in this situation situation in this situation you just need to see who is a zero degrees C minus.
Jin-Yi Yu: Zero degrees team is you're decreasing is the decrease in is and then second will need to have more moisture surprising in moisture coming here has produced praising the moisture here so here in a situation, a this is really cool, I think, from my situation you don't have any project.
Jin-Yi Yu: He called us or co producer he produced, you can see these high prices is pushing all the way to where to do, of course, is important akaka because.
Jin-Yi Yu: paper to go over this color and then, when you go to most of these zero degrees see the red line they your form the freezing perspective okay see it here.
Jin-Yi Yu: We have we see here right and everyone is getting closer to this area, then you have water vapor call it, so how, how can.
Jin-Yi Yu: I can call in on that, because this is, this is a high pressure, how we need high pressure because high pressure is Coco Coco is when you know crack wise is going to go over Ocean is here.
Jin-Yi Yu: Look here, this is Atlantic Ocean.
Jin-Yi Yu: Because most Americans here in the United States here.
Jin-Yi Yu: So we have this high pressure to zero credit clockwise the green or a motion.
Jin-Yi Yu: To hop over this zero degree side you'll see right right, so in this situation is situation he is a selfie photo was of high privacy, you need to have something for.
Jin-Yi Yu: The rest of high pressure and then our print this moisture to the cold air right, because we know this high project, I mean he has called here.
Jin-Yi Yu: Right you North Korea behind and we just need to clean the fancy when promoting from South to North on the Western side and then to me that's why sourcing for Western high pressure on my show move over to adding some to produce this situation Okay, the conversion is either you have.
Jin-Yi Yu: One from association so circle circle, all you have to.
Jin-Yi Yu: Hope as you're.
Jin-Yi Yu: approaching to the coastal area to meet to allow co heir to meet with the moisture you how.
Jin-Yi Yu: amazing these two are very similar.
Jin-Yi Yu: So you have a low pressure moving tyree all the ocean and then on the Western side you produce 1000 with the emotion from the South to the North or the South me if you agree, see pass.
Jin-Yi Yu: rusher the way.
Jin-Yi Yu: It is to ingredient, then, is possible to produce the freezing press because that's the simple five view of this slide okay.
Jin-Yi Yu: So.
Jin-Yi Yu: You said the way to produce this.
Jin-Yi Yu: Funding situation is that it is very unique relate to appalachia mountain because so freezing but we're going to see that this is a poetry mountain to eastern sale.
Jin-Yi Yu: But it amanda is one of the key access kochi region or freezing presentation over the United States, so you need to explain.
Jin-Yi Yu: Why freezing precipitation happens so often to the eastern side of Apache amanda Okay, the answer is call call me.
Jin-Yi Yu: sort of freezing presentation occur frequently along the eastern side of appalachia mountains are associated with this phenomenal record called a dynamic.
Jin-Yi Yu: So 15% freezing crustacean event affecting the United United States are rocky mountain our team to this call them in process, so what happened is that the East that he associated with the high pressure Center over our hunting for the coil here.
Jin-Yi Yu: There are three situation you can produce this damage, so you have a month and year documented this, the United States is Atlantic so you're gonna chop Korea and.
Jin-Yi Yu: watch the inside instance our Apache mountain So how can you tropical area here I mean you have to producer emotion that comes in trying to.
Jin-Yi Yu: keep this prevent these Korea running out of Atlanta area Okay, so how can you produce this week as situation, a in a situation, a, we will have a nice day one, right here.
Jin-Yi Yu: associate was high price, because hyperlink is moving clockwise So if you have high pressure located on the Atlantic Ocean, then, to a north of Atlanta.
Jin-Yi Yu: And then, this happens in the push for us history will they will keep this Korea them in an instance of the Apache amanda and not cold air is going to allow this reason presentation to happen because Korea Tokyo is moisture nearby is going to produce that chicken, you need to have.
Jin-Yi Yu: A second developing around the east coast of Mexico Atlantic to move, so you have how pressure located to the North Atlantic then you're putting me.
Jin-Yi Yu: You have to remember and also, we will talk about these coasts icon and costco cycle so east coast back from Cancun cycle, you know we're not developing around a coastal region, because when it you happy or across the region remember it is under here it to the middle Atlantic.
Jin-Yi Yu: coast, so this is all pressure, so no pressure here is going to produce a counter clockwise will.
Jin-Yi Yu: conduct or two rescoring also produce Eastern so the simple thing is either your high pressure to the mouse of appalachia mountain and how to produce clockwise or decent you win.
Jin-Yi Yu: Or you know pressure located to the south Apache amanda producer counter clockwise clockwise relate to the high to North on a commoner car comes when related to.
Jin-Yi Yu: The project to the cells appalachian a post or producing easily when to keep this particular career Damien process or the last one is queen cycle East of the rocky mountain move to the third through upgraded region, right here.
Jin-Yi Yu: and his own firm is is a Defense on either side of appalachia Monday, they will produce these tammy that's a situation OK, so the conclusion to simplify the stem a year is.
Jin-Yi Yu: done can happen if you have high pressure to the nose in it to the massage room and you produce east coast mega cycles produce a crop circle, or you have.
Jin-Yi Yu: cycles are moving over to the region so whenever you have whenever you have a cycle in the East have a nice day it is likely they're going to put these this Korea.
Jin-Yi Yu: Yes, at some point in their life cycle that's right these.
Jin-Yi Yu: phenomena happen very frequently so apart your mountain as well we look at the distribution of freezing when you notice that there is one access coming down here, so we understand this, because we all say in order to produce these.
Jin-Yi Yu: Results infestation is related to this cycle, because it's also because icon and when.
Jin-Yi Yu: We are in trouble circle in the United States, they come in the east coast, they come Colorado Colorado.
Jin-Yi Yu: or a creeper or QA cycle each source now go to the last Easter island New England area United States and when they come here.
Jin-Yi Yu: They are can have on the eastern side of one on one phone they're going to produce freezing rain that's right free offer this Colorado a creeper.
Jin-Yi Yu: causes cancer they're going to come into come here and when they come here they're going to produce this freezing perspective not freezing because phase your frequency is the maximum in this new in an area, however, we notice that this.
Jin-Yi Yu: actually coming down here and let's read a tool, the appalachian mountain the code Damien phenomena I just described right in a reason because whenever you are called.
Jin-Yi Yu: on the east coast cycle Oregon coast coast, they are called a truck or Korea and the eastern side or appalachian mountain that's why it's going to put using.
Jin-Yi Yu: pleasing good Okay, I need to remember this, so you can close your eyes say why is the freezing when this pollution frequent freezing precipitation is not happen most frequently there you say is this area right in this area is.
Jin-Yi Yu: Over the United States okay well, can we see the distribution of freezing drizzle is a slightly different from the freezing freezing rain is North Eastern part in appalachia a record of freedom frustration is not unlimited power and in the.
Jin-Yi Yu: middle middle.
Jin-Yi Yu: Okay, because the distribution of frequency so is different from the distribution of freezing bread so you're going.
Jin-Yi Yu: To be very careful if you're fine in a northern half of the middle is an ev charging car in the window not you have to be very careful toby in the New England area and he saw.
Jin-Yi Yu: Our platform on that because that's where you're going to see it progress that's very different for aviation or for low traffic okay now what that's fine we have what are freezing.
Jin-Yi Yu: So in this area right that is green tea so.
Jin-Yi Yu: i'm not about your frequencies from over the central US and Canada, remember that.
Jin-Yi Yu: Is a love over because we're so the reason is going to be similar as we go into the sprint when we talk about political happening doing this in the last days, also in this.
Jin-Yi Yu: area, because this reading is a series of fact there's momentum so the Muslim area from her and I tropical oma can go to me continental polar mm.
Jin-Yi Yu: hmm so they need each other, particularly very easy in this area in this area in this area, your mountain that's why this area is the area that ran most from the South is going to mean please call dry air for North America form very low crowd.
Jin-Yi Yu: Though.
Jin-Yi Yu: crowd and then my low cost to produce soda well Amir is the all word article we're creating stress crowd right no crowd and this local is where we're going to produce these memories one.
Jin-Yi Yu: yeah has to be local computer can scope, and I can I be too cold and that's where we're going to produce the the.
Jin-Yi Yu: Freezing drizzle and let's try so and then i'll typical rp from originate in the central Canada most songs for into Central us where the phrase injuries occur freezing so is really the Western us.
Jin-Yi Yu: And then, finally, how can we forecast of freezing persuasion as we explained here.
Jin-Yi Yu: In this post.
Jin-Yi Yu: In this slide here what's important is a very clear structure of the temperature in our.
Jin-Yi Yu: pastor you want to tell people, whether or not we're going to get freezing precision, you need to look at the vertical Sunday the Sunday have a temperature so very is the typical pattern.
Jin-Yi Yu: Because sending pattern is going to produce freezing perspective if something is just temperature is it just going down all the way, then he cannot producing freezing precision in producing freezing Professor that teasing is need to have immersive.
Jin-Yi Yu: No service has to be very cold colder than zero degrees C and then there's a sandwich they are warm air and then he's gonna call again.
Jin-Yi Yu: And this is the typical way for him, he has medical standing show, something that is.
Jin-Yi Yu: Then you know is possible to produce freezing precipitation is freezing run off as pilot depends on if.
Jin-Yi Yu: We see a car zero degrees, he is here okay so i've got some your temperature and amongst your critical for forecasting freezing precipitation Okay, it is particularly important to pay attention to the presence of any above freezing there in the low is few kilometer if there is a temperature.
Jin-Yi Yu: There, that is the purpose God we see them as possible Nina survey, then, is possible producing the freezing presentation, but I just want you to remember these are going to stop here Oh, my goodness, I mean.