TORNADOES.

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Presentation transcript:

TORNADOES

U.S averages 800 tornadoes/year; more than any country

Canton, MI Dec. 23, 2015 EF-1 (90 mph winds)

933 tornadoes in 2016

2016

Moore OK, May 20, 2013

definition A vertically rotating column of air (funnel) Low pressure

Conditions that favor tornado formation

FORMATION OF mT collides with cP (T-storm) Strong winds aloft create horizontal spinning Updrafts lift rotating air

Tornado formation – instant egghead https://www.youtube.com/watch?v=7bHSS1ImFQI

TORNADO ALLEY Why so many tornadoes here?

Why do tornadoes pick up things? “We’ve got cows” https://www.youtube.com/watch?v=2dQgjrrEeHA

In Low pressure air is ________

Supercell- long lived t-storm with updrafts

supercell

Multiple vortexes

Which way is this storm moving?

WATCHES AND WARNINGS TORNADO WATCH TORNADO WARNING Conditions are favorable mT/cP colliding Strong updrafts TORNADO WARNING A tornado has formed (sited or by radar) Take cover!

DOPPLER RADAR Shows wind movement; Redshift/blueshift = horizontal rotation

Doppler Radar Look for radar “hook” = TORNADO!

Enhanced Fujita Scale

Tornado season?

Joplin, MO May 22, 2011 EF5 160 deaths 7th worst in US history 75% of town damaged

DAMAGE Most from flying debris

Tornado myths

What to do? get to a low place basement or center of house Seek shelter under something sturdy Don’t waste time opening windows!

July 2, 1997 Grosse Pointe Farms (F-4)

Flint-Beecher Tornado Deadliest in Michigan June 3, 1953 116 dead F-5

11-11-11 11:11 Owosso, MI

Waterspouts Smaller Less damaging

Dust devils Form in fair weather Hot air rises into cooler air Not dangerous