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Tornadoes Twisters

Nature's most violent atmospheric vortex — 500 km/h winds and the science of Tornado Alley.

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About

Tornadoes — rapidly rotating columns of air extending from thunderstorm clouds to the Earth's surface — are measured on the Enhanced Fujita (EF) scale from EF0 (minor damage) to EF5 (incredible damage, winds >322 km/h). EF5 tornadoes can level reinforced concrete structures. The US experiences approximately 1,000 tornadoes annually — 75% of the world's total — primarily in 'Tornado Alley' (Texas, Oklahoma, Kansas, Nebraska) where warm Gulf air meets cold Arctic air. The deadliest tornado in US history: the Tri-State Tornado (March 18, 1925, Missouri-Illinois-Indiana) killed 695 people, traveled 352 km (the longest track ever), and was rated F5. Modern tornado prediction (Doppler radar, storm chasers, NWS) provides an average 13-minute warning — an improvement from near-zero in 1950 but still insufficient for many rural areas. The 2011 Joplin, Missouri tornado (EF5) killed 161 people despite 24-minute warning. Climate change is extending the tornado season and expanding Tornado Alley eastward.

# Top 10 tornado facts

  1. 1EF5 winds >322 km/h
  2. 2Tri-State 1925 (695 deaths, 352km path)
  3. 3Tornado Alley
  4. 4Doppler radar warning
  5. 5storm chasers
  6. 61,000/year in US (75% of world total)
  7. 7EF5 destroys concrete
  8. 8Joplin 2011
  9. 9Bangladesh most dense tornado region
  10. 10waterspout (tornado over water)

Fascinating Facts

  • ◆The Tri-State Tornado of 1925 traveled 352 km across three states — the longest tornado path ever recorded — taking 3.5 hours and killing 695 people, most of whom had no warning
  • ◆EF5 tornadoes generate winds exceeding 320 km/h — strong enough to drive a piece of straw through a tree trunk and strip the bark off trees
  • ◆Bangladesh experiences the world's most lethal tornadoes relative to its size — its flat topography, dense rural population, and weak housing combine to make even moderate tornadoes deadly
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