-Small intense vortex of spinning air often at increased speeds. -Associated with storms that develop in association with mid latitude cyclones or tropical cyclones.
-Dark funnel cloud hanging from the base of a dense cumulonimbus cloud. -Appears dark because of moisture, debris, and dust inside. -Wind speeds exceed speeds known in any other storm, ranging from 40 mph- 300 mph - General tornado is about 110 mph
-Intense wind speed of a tornado is caused by extreme pressure differences over very short horizontal distances. -Large pressure gradient force, resulting in intense wind speeds as the air rushes into the low-pressure center of the
-99% of tornadoes in the Northern Hemisphere rotate counterclockwise. -99% of tornadoes in the Southern Hemisphere rotate clockwise.
-Associated with severe thunderstorms. -Severe thunderstorms provide a key ingredient for tornadoes- strong vertical circulation. -The other key ingredient is the presence of wind shear.