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TORNADO STRIKES DEXTER, MICHIGAN
Thursday, March 15, 2012
Walter Hays, Global Alliance for Disaster Reduction, University of
North Carolina, USA
MICHIGAN: NOT PART OF USA’S “TORNADO ALLEY”
MICHIGAN: NOT PART OF USA’S “TORNADO ALLEY”
The slow-moving storm, which
stayed on the ground for 30 minutes, brought hail, rain, and
high winds reaching 225 kph (135 mph) along its 16 km (10
mile) path
WIND PENETRATING BUILDING ENVELOPE
TORNADOESTORNADOES
UPLIFT OF ROOF SYSTEM
FLYING DEBRIS
RAIN AND HAIL
IRREGULARITIES IN BUIOLDING ELEVATIONS
NO ADVANCE WARNING
NO PLACE TO EVACUATE
CAUSES OF DAMAGE
CAUSES OF DAMAGE
“A SEASONAL DISASTER
LABORATORY”
“A SEASONAL DISASTER
LABORATORY”
INITIAL REPORTS
• No deaths
• Localized wind and hail damage, with more than 100 homes destroyed
• Power outages and fires
• Hail damage and local flooding
TORNADO FUNNEL (CENTER) IN DEXTER, MICHIGAN: MARCH 15, 2012
AERIAL VIEW OF DAMAGE: DEXTER, MICHIGAN: MARCH 15, 2012
OVERTURNED CAR IN DEXTER, MICHIGAN: MARCH 15, 2012
WIND DAMAGE TO HOUSES IN DEXTER, MICHIGAN: MARCH 15, 2012
WIND DAMAGE TO HOUSES IN DEXTER, MICHIGAN: MARCH 15, 2012
WIND DAMAGE TO HOUSES IN DEXTER, MICHIGAN: MARCH 15, 2012
WIND DAMAGE TO HOUSES IN DEXTER, MICHIGAN: MARCH 15, 2012
WIND DAMAGE TO HOUSES IN DEXTER, MICHIGAN: MARCH 15, 2012
WIND DAMAGE TO HOUSES IN DEXTER, MICHIGAN: MARCH 15, 2012
WIND DAMAGE TO HOUSES IN DEXTER, MICHIGAN: MARCH 15, 2012
DEBRIS OF ALL KINDS: DEXTER, MICHIGAN: MARCH 15, 2012
THE EMERGENCY RESPONSE PROCESS
BEGINS
Realistic Protection Measures Can Be Included During The
Subsequent Recovery Process
MARCH 16: STARTS WITH POWER RESTORATION;TREE AND DEBRIS REMOVAL
FUTURE RECONSTRUCTION: WIND ENGINEERING:
FUTURE RECONSTRUCTION: WIND ENGINEERING:
• SEVERE WINDSTORMS CAN NOT BE PREVENTED, BUT
• BUILDING CODES CAN PREVENT LOSS OF ROOF SYSTEMS
• SEVERE WINDSTORMS CAN NOT BE PREVENTED, BUT
• BUILDING CODES CAN PREVENT LOSS OF ROOF SYSTEMS
FUTURE RECONSTRUCTION: WIND ENGINEERING
FUTURE RECONSTRUCTION: WIND ENGINEERING
• ACTIONS TO KEEP THE WIND AND RAIN OUT OF THE HOUSE CAN BE TAKEN IN ADVANCE OF THE NEXT TORNADO TO PREVENT LOSS.
• ACTIONS TO KEEP THE WIND AND RAIN OUT OF THE HOUSE CAN BE TAKEN IN ADVANCE OF THE NEXT TORNADO TO PREVENT LOSS.
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