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2011’S TREND OF DAMAGING TORNADOES CONTINUES IN THE MIDWESTERN USA February 28-29, 2012 More lectures at Disasters Supercourse - http://www.pitt.edu/~super1/collections/collection52.htm Walter Hays, Global Alliance for Disaster Reduction, University of North Carolina, USA

EARLY SEASON TORNADOES RIP THROUGH 6 STATES Homes, trailer parks, shopping malls, churches, hospitals, and resorts were damaged and destroyed by high winds as tornadoes touched down in Kansas, Missouri, Illinois, and 3 other Midwestern states.

DAMAGE: HARRISBURG, IL: FEB. 29, 2012

WIND DAMAGE: BRANSON, MISSOURI

WIND DAMAGE: BRANSON, MISSOURI

2011’S TORNADOES KILLED 550 PEOPLE. BACKGROUND 2011’S TORNADOES KILLED 550 PEOPLE.

THE TREND CONTINUES: MORE TORNADOES IN 2011 THAN IN 2010 SPRING WEATHER CREATES FAVORABLE CONDITIONS FOR SEVERE STORMS APRIL 14-16, 2011

MAP OF THE USA’s “TORNADO ALLEY”

2011: MORE TORNADOES THAN IN 2010 JANUARY---10 FEBRUARY---67 MARCH---115 APRIL---141 MAY---??

FAVORABLE CONDITIONS FOR CREATION OF SEVERE STORMS Strengthening winds Daytime heating Low-level moisture return along and ahead of cool front

During 2011, the combination of strengthening winds, daytime heating, and low-level moisture returne ahead of the cold front created an environment favorable for the development of long-lived super cell thunderstorms that produced strong tornadoes.

SUCH WAS THE CASE ON APRIL 14-16, 2011

THE APRIL 14-16 EXAMPLE: A SEVERE WEATHER SYSTEM THAT MOVED EAST ACROSS THE USA ON APRIL 14-16 SPAWNED NEARLY 100 TORNADOES IN OK, AR, MS, AND AL, DAMAGED COMMUNITIES, AND KILLED 17 PEOPLE IN THREE DAYS.

THE SEVERE WEATHER SYSTEM SPAWNED 5 TORNADOES IN OKLAHOMA: APRIL 14TH AFTER A TORNADO LEFT A ½ MILE WIDE AND 7 MILE LONG PATH OF DESTRUCTION IN THE TOWN OF TUSHKA, OK, THE SYSTEM MOVED ON INTO ARKANSAS

TUSHKA: DAMAGE FROM TORNADO

TUSHKA: MOBILE HOME DESTROYED

TUSHKA: HOUSE DAMAGED AND CAR OVERTURNED

IMPACTS IN ARKANSAS The same weather system also spawned tornadoes with 130 kph (80 mph) winds in Arkansas, killing seven. .

IMPACTS IN ALABAMA The same weather system spawned tornadoes in six counties in Alabama Friday, causing at least eight deaths. .

IMPACTS IN MISSISSIPPI Tornadoes spawned by the same system caused major damage in the town of Clinton, near Jackson, the capitol of Mississippi.