Tornadoes Flashcards
A rapidly rotating column of air that blows around a small area of intense, low pressure with a circulation that reaches the ground
Tornado
tornadoes form
In association with cumulonimbus clouds
Form when mT air masses and cP air masses, interact
Form after a meso cycle phone is produced
vertical cylinder of rotating air that develops in the updraft of a severe thunderstorm
Mesocyclone
Different wind speeds, or directions at different heights in the atmosphere
Windshear
Differences in wind, speed or direction produce rolling motion about a horizontal axis
Mesocyclone stage one
Strong updrafts tilt the horizontally, rotating air vertically
Mesocyclone stage two
vertically rotating column of air, Tightens and spin faster
Mesocyclone stage three
Area of rotating clouds that extends we need a thunderstorm from which a funnel may form
Wall cloud
Tornado that hasn’t made contact with the ground
Funnel cloud
tornado frequency
Tornadoes most common in Spring April to June
Contrast between mT and cP air masses, strongest
Tornadoes most common in late afternoon
Month with most tornadoes
May
Month with most tornado days
June
Texas, Oklahoma, Kansas, Nebraska
States that experience more frequent tornadoes
Tornado alley
Mississippi, Alabama, Louisiana, Arkansas, Tennessee
Gulf coast states that experience more frequent destructive tornadoes
Dixie alley
dimensions of a typical tornado
Diameter 500 to 2000 feet
Path length 1 to 4 miles
duration 10 minutes
Speed of storm 30 mph
Speed of wind 65 mph to 310 mph
Direction southwest to northeast ahead of cold front