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August 13-14, 2009: Significant Flash Flooding in Pepin and Pierce Counties in Wisconsin
Radar Estimate | Reports | Photos
An organized and persistent area of showers with embedded thunderstorms increased in intensity during the evening of the 13th and the early hours of the 14th across Pierce, Pepin, Eau Claire, and southern Dunn Counties in west central Wisconsin. This concentrated rain was slow-moving and heavy, which led to rainfall amounts between four and eight inches and severe flash flooding. The storms were slow moving because of light upper level winds, typical of an August pattern over Minnesota. Also familiar of late summer, the atmosphere was ripe with moisture. These ingredients created the flash flooding setup.
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NWS Chanhassen Doppler Radar Event Total Rainfall Estimate |
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The Doppler Radar and rainfall reports indicate the heaviest rain fell across western and northwestern Pepin County. |
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Storm Reports From August 14, 2009 |
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The map above and the below listing are of severe weather and flash flooding reports received during or soon after the event by the National Weather Service from local government officials or trained storm spotters. These reports should be considered preliminary and are open to further quality controlling by NWS officials. For reports from across the country, click here.
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
920 AM CDT FRI AUG 14 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0855 PM TSTM WND DMG 3 NNE HAGER CITY 44.64N 92.51W
08/13/2009 PIERCE WI LAW ENFORCEMENT
PIERCE COUNTY DISPATCH HAD RECEIVED A REPORT OF A TREE
DOWN ALONG HWY 63 NORTH OF HAGER CITY.
0940 PM FLASH FLOOD MAIDEN ROCK 44.57N 92.31W
08/13/2009 PIERCE WI LAW ENFORCEMENT
PIERCE COUNTY DISPATCH HAS RECEIVED REPORTS OF A FEW
ROADS CLOSED BY HIGH WATER ACROSS THE SOUTHERN PART OF
THE COUNTY.
0955 PM HEAVY RAIN 3 W ELLSWORTH 44.74N 92.54W
08/13/2009 M3.50 INCH PIERCE WI TRAINED SPOTTER
0955 PM FLASH FLOOD 3 W ELLSWORTH 44.74N 92.54W
08/13/2009 PIERCE WI TRAINED SPOTTER
STANDING WATER IN FARM FIELDS AND ON U.S. HIGHWAY 10.
1030 PM FLASH FLOOD 4 NNW MAIDEN ROCK 44.62N 92.34W
08/13/2009 PIERCE WI LAW ENFORCEMENT
MUD SLIDE WAS REPORTED ALONG HIGHWAY A BETWEEN STATE ROAD
35 AND US 10.
1050 PM FLASH FLOOD ELLA 44.54N 92.05W
08/13/2009 PEPIN WI LAW ENFORCEMENT
MUDSLIDE ON COUNTY ROAD N NEAR ELLA HAS CLOSED THE
HIGHWAY.
1207 AM FLASH FLOOD 1 S EAU CLAIRE 44.81N 91.49W
08/14/2009 EAU CLAIRE WI LAW ENFORCEMENT
LOWES CREEK ROAD WASHED OUT JUST OUTSIDE OF EAU CLAIRE.
0130 AM FLASH FLOOD ARKANSAW 44.63N 92.03W
08/14/2009 PEPIN WI TRAINED SPOTTER
NUMEROUS ROAD CLOSURES IN TOWN. AN EXPERIMENTAL FARM
REPORTED 6.5 INCHES OF RAIN WITHIN TWO HOURS.
0200 AM HEAVY RAIN PLUM CITY 44.63N 92.19W
08/14/2009 M5.50 INCH PIERCE WI TRAINED SPOTTER
0300 AM FLASH FLOOD 3 S ARKANSAW 44.59N 92.03W
08/14/2009 PEPIN WI TRAINED SPOTTER
ROADS WASHED OUT IN FRANKFORT TOWNSHIP.
0300 AM HEAVY RAIN 3 NNW MAIDEN ROCK 44.61N 92.33W
08/14/2009 M4.50 INCH PIERCE WI TRAINED SPOTTER
0610 AM HEAVY RAIN 4 NW ARKANSAW 44.67N 92.09W
08/14/2009 M7.34 INCH PEPIN WI MESONET
MEASURED BY COCORAHS OBSERVER.
0700 AM FLASH FLOOD DURAND 44.63N 91.96W
08/14/2009 PEPIN WI CO-OP OBSERVER
MINOR MUDSLIDES IN AND NEAR DURAND.
0700 AM HEAVY RAIN 4 N AUGUSTA 44.74N 91.12W
08/14/2009 M3.40 INCH EAU CLAIRE WI CO-OP OBSERVER
MEASURED NEAR LAKE EAU CLAIRE.
0700 AM HEAVY RAIN DURAND 44.63N 91.96W
08/14/2009 M6.50 INCH PEPIN WI CO-OP OBSERVER
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Washed out roadway above the Arkansaw Creek. |
