Mapleton Iowa Tornado April 9 2011

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
308 PM CDT SUN APR 10 2011

...TORNADO DAMAGE IN MONONA COUNTY IOWA INCLUDING MAPLETON...

THIS IS A PRELIMINARY MESSAGE. ADDITIONAL DETAILS MAY BE PROVIDED LATER.

A SURVEY TEAM DID A DAMAGE ASSESSMENT OF THE TORNADO THAT MOVED ACROSS PARTS OF MONONA COUNTY IOWA SATURDAY EVENING APRIL 9 2011.  THIS INCLUDED THE TOWN OF MAPLETON.

SO FAR...A PATH LENGTH OF AROUND 3.5 MILES HAS BEEN DETERMINED. THE MAXIMUM WIDTH OF THE TORNADO WAS 0.75 MILES. THE WORST DAMAGE WAS NOTED TO BE IN THE LOWER END OF THE EF3 CATEGORY.  THE TORNADO STARTED ABOUT 2 MILES WEST SOUTHWEST OF MAPLETON, MOVED INTO TOWN, THEN TURNED NORTH AND ENDED 1 MILE NORTH OF MAPLETON.

MONONA COUNTY EMERGENCY MANAGEMENT ESTIMATED 12 TO 14 INJURIES...THE WORST OF WHICH WAS A BROKEN LEG.

ENHANCED FUJITA SCALE  
EF0...65 TO 85 MPH                 Blue Triangles = EF0
EF1...86 TO 110 MPH               Green Triangles = EF1            
EF2...111 TO 135 MPH             Yellow Triangles = EF2
EF3...136 TO 165 MPH            Orange Triangles = EF3
EF4...166 TO 200 MPH  
EF5...201+ MPH
  


 

Radar Imagery

Reflectivity of the supercell thunderstorm producing the Mapleton tornado. Notice how the city of Mapleton is in the hook area of the thunderstorm.

Storm-relative velocity imagery of the circulation that produced the Mapleton tornado.

Pictures Taken in the City of Mapleton 

The National Weather Service damage assessment team encountered tree and crop damage 1.5 miles southwest of Mapleton with significant damage across the city of Mapleton.  The tornado strengthened as it moved into Mapleton and weakened on the north side of town, lifting just north of town.  Much of the city was affected by the tornado with numerous outbuildings and garages destroyed, trees snapped and damage to homes and businesses.

   
     
     
     

 



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