Hurricane Formation
•Tropical Disturbance: Clusters of small thunderstorms.
•Tropical Depression: When at least one closed isobar is present, the disturbance is classified as a tropical depression.
•Tropical Storm: Further
intensification, to wind speeds of 60 km/hr (37 mph), place the storm in the category of tropical storm.
•Hurricane: Hurricane status is gained when winds reach or exceed 120 km/hr (74 mph).