Severe Weather A tornado forms when wind speed and direction change suddenly with height in an updraft, a phenomenon called wind shear. Severe thunderstorms can turn into supercells, intense rotating updrafts. Tropical cyclones form over warm ocean waters in low pressure systems, when rotation increases and air pressure drops.
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A Severe Weather...Anatomy Of a tropical'cyclone clockwiseA'inds Ine EF Rating Wind Speeds 65-85 mph 86-110 mph 111-135 mph 136-165 mph > 200 mph Expected Damage 'Minor' damage: shingles
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Severe Weather
A tornado forms when wind speed and direction change suddenly with height in an updraft, a phenomenon called wind shear.
Severe thunderstorms can turn into supercells, intense rotating updrafts.
Tropical cyclones form over warm ocean waters in low pressure systems, when rotation increases and air pressure drops.
Enhanced Fujita Tornado Damage scale: ranks tornadoes according to destruction and estimated wind speed
Joplin, MissouriEF5May 2011
Tornadoes 101
Tropical Storms
Tropical cyclones are also known as hurricanes and typhoons.
Storm surge: hurricane force winds drive ocean water towards coastal areas and onto land.