Interesting Facts About Tornadoes

 Here are Few but very interesting Facts about Tornadoes:

• A tornado is a violently rotating column of air that descends from a thunderstorm to the ground.
• Every U.S. state has experienced twisters, but Texas holds the record: an annual average of 120.
• Tornadoes have been reported in Great Britain, India, Argentina, and other countries, but most tornadoes occur in the United States.
• Tornadoes form when warm, humid air collides with cold, dry air.
• The most violent tornadoes come from supercells, large thunderstorms that have winds already in rotation.
• Most tornadoes in the United States occur in Tornado Alley, a swath that stretches from Texas to Nebraska and also includes Colorado, Iowa, Indiana, Illinois, Kansas, Missouri, and Arkansas.

• Tornado season begins in early spring for the states along the Gulf of Mexico. The season follows the jet stream—as it swings farther north, so does tornado activity.
• Twisters are usually accompanied or preceded by severe thunderstorms, high winds, or hail.
• Once a tornado hits the ground, it may live for as little as a few seconds or as long as three hours.
• The average twister is about 660 feet (200 meters) wide and moves about 30 miles (50 kilometers) per hour.
• Meteorologists at the U.S. National Weather Service use Doppler radar, satellites, weather balloons, and computer modeling to watch the skies for severe storms and tornadic activity.

Some of the Tornado Details of the Casualties are here:

La Plata, Maryland
April 28, 2002
Fujita scale intensity: F2, F4
Dead: 3
Injured: 122
Damage: More than $100 million

Oklahoma Outbreak
May 3, 1999
Fujita scale intensity: F3-F5
Dead: 47
Injured: More than 775

Pleasant Grove Tornado (Alabama)
April 8, 1998
Fujita scale intensity: F5
Dead: 32

Tornado Outbreak (Central Florida)
February 22-23, 1998
Fujita scale intensity: F0-F5
Dead: 32
Injured: 260

Edmonton, Alberta, Canada
July 31, 1987
Fujita scale intensity: F4
Dead: 27

Super Outbreak (Alabama, Georgia, Illinois, Indiana, Kentucky, Michigan, Mississippi, North Carolina, Ohio, South Carolina, Tennessee, Virginia, and West Virginia)
April 3-4, 1974
Fujita scale intensity: F0-F5
Dead: 330
Injured: 5,484

Palm Sunday Outbreak (Indiana, Iowa, Michigan, Ohio)
April 11-12, 1965
Fujita scale intensity: F4-F5
Dead: More than 260
Injured: 3,400
Damage: More than $200 million

Flint Tornado (Michigan) 
June 8, 1953
Fujita scale intensity: F5
Dead: 115
Injured: 844

Waco Tornado (Texas)
May 11, 1953
Fujita scale intensity: F5
Dead: 114
Injured: 597

Arkansas Outbreak (Arkansas, Tennessee)
March 21, 1952
Dead: More than 260
Injured: 3,400

Woodward Tornado Outbreak (Kansas, Oklahoma, Texas)
April 9, 1947
Fujita scale intensity: F5
Dead: 181
Injured: 970

Ohio Valley (Maryland, Pennsylvania, West Virginia)
June 23, 1944
Dead: About 150
Injured: Over 800

Tupelo-Gainesville (Mississippi, Georgia)
April 5-6, 1936
Fujita scale intensity: F4
Dead: 454
Injured: 2,300

Northern Alabama
March 21-22, 1932
Dead: 268

Tri-State Tornado (Illinois, Indiana, Missouri)
March 18, 1925
Fujita scale intensity: F5
Dead: 689
Injured: More than 2,000
Damage: About $18 million (1925 dollars)

Regina, Saskatchewan, Canada
June 30, 1912
Dead: 28

Tornado Outbreak (Louisiana, Mississippi)
April 24, 1908
Fujita scale intensity: F4
Dead: 143
Injured: 770

New Richmond Tornado (Wisconsin)
June 12, 1899
Fujita scale intensity: F5
Dead: 117
Injured: 200

St. Louis Tornado (Illinois, Missouri) 
May 27, 1896
Fujita scale intensity: F4
Dead: 255
Injured: 1,000

Natchez Tornado (Louisiana, Mississippi)
May 7, 1840
Fujita scale intensity: Undetermined
Dead: 317
Injured: 107

Source & Read More: National Geographic