Wind-Parallel Rolls
C:\Documents and Settings\Bob\Desktop\Work\Book-Edition 3\E3 Chapter 13 Lake Effect Storms\Chapter 13 Final Figures\CH13 Gifs with copyright\Fig.13.10.jpg
qIn cases when winds are strong and blow with a component across the short axis of a lake, wind-parallel rolls may form.
q When the cool air moves across the warm lake, cooler air aloft must sink to replace the warmer rising air.
qThese rising and sinking motions often take the form of rolls that align parallel to the wind.
qThe upward branches (develop clouds and precipitation) of the rolls are typically 1 to 2 km wide and spaced (by the clear sky associated with the sinking branches) up to 10km.