Flash Flood Risk. NWS Doppler out of Grand Forks is estimating some 6-10" rainfall amounts over far southeastern North Dakota and northeastern South Dakota, 2-3 month's worth of rain overnight. These storms are weakening, but still capable of some 3-6" rainfall amounts from near Wheaton to Breckenridge and Wheaton. More from the NWS:

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
817 AM CDT MON AUG 15 2011

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  RICHLAND COUNTY IN SOUTHEAST NORTH DAKOTA...
  WILKIN COUNTY IN WEST CENTRAL MINNESOTA...

* UNTIL 800 PM CDT MONDAY

* AT 817 AM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED            
  THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA.     
  THE RADAR INDICATED 4 TO 6 INCHES OF RAINFALL HAD ALREADY FALLEN   
  IN THE LIDGERWOOD AND HANKINSON AREAS.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  WAHPETON...BRECKENRIDGE...HANKINSON...LIDGERWOOD...WYNDMERE...     
  ABERCROMBIE AND BARNEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT DRIVE YOUR
VEHICLE INTO WATER OF UNKNOWN DEPTH. ONE OR TWO FEET OF WATER WILL
FLOAT MOST CARS DOWNSTREAM.

Weakening Storms. NWS Doppler out of the Twin Cities at 11:23 am shows heavy showers and T-storms from Alexandria and Glenwood westward to Wheaton - drifting east/northeast - the bulk of the rain may stay just north of MSP early this afternoon.

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Slight Severe Risk Later Today (did a "gustnado" hit the Indiana State Fair?)