National Weather Service Weather Forecast Office

A bow echo produced areas of damaging winds across the Missouri River Valley late in the evening of August 7, 2011.  Below is a map indicating where strong winds and/or damage were reported, along with a snapshot of the radar showing the bow echo at 10:55PM.  You can view an interactive map/listing of these reports by clicking on the image below. A text listing of the reports is available below the map.

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE SIOUX FALLS SD
358 AM CDT MON AUG 08 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1001 PM     TSTM WND GST     1 SE MARTY              42.98N 98.41W
08/07/2011  E60.00 MPH       CHARLES MIX        SD   TRAINED SPOTTER

            AT LEAST 60 MPH. ROCKING FARM EQUIPMENT PARKED IN YARD

1016 PM     TSTM WND GST     8 W SPRINGFIELD         42.85N 98.06W
08/07/2011  E55.00 MPH       BON HOMME          SD   TRAINED SPOTTER

            50 MPH TO 55 MPH. LOAD ROARING SOUND. TREES BENDING OVER.


1106 PM     TSTM WND GST     WAKEFIELD               42.27N 96.87W
08/07/2011  E55.00 MPH       DIXON              NE   CO-OP OBSERVER

            50 MPH TO 55 MPH. PATCH OF CORN IN THE GARDEN FLATTENED.

1134 PM     TSTM WND GST     NORTH SIOUX CITY        42.54N 96.50W
08/07/2011  E60.00 MPH       UNION              SD   TRAINED SPOTTER

1135 PM     TSTM WND DMG     SIOUX CITY              42.50N 96.39W
08/07/2011                   WOODBURY           IA   EMERGENCY MNGR

            TREES DOWN...INCLUDING ONE TREE ON A HOUSE.

1136 PM     TSTM WND GST     2 N SALIX               42.34N 96.29W
08/07/2011  E60.00 MPH       WOODBURY           IA   TRAINED SPOTTER

1138 PM     TSTM WND GST     5 SSE SIOUX CITY        42.44N 96.36W
08/07/2011  M63.00 MPH       WOODBURY           IA   TRAINED SPOTTER

            SEVERAL SMALL LIMBS ALSO DOWN.

1225 AM     TSTM WND GST     6 SSW BATTLE CREEK      42.24N 95.64W
08/08/2011  E60.00 MPH       IDA                IA   TRAINED SPOTTER

            ALONG WITH HEAVY RAINFALL


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