BULLETIN – EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1110 PM CDT SUN AUG 7 2011

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR…
NORTHEASTERN DAKOTA COUNTY IN NORTHEAST NEBRASKA
NORTHWESTERN WOODBURY COUNTY IN WEST CENTRAL IOWA
SOUTHEASTERN UNION COUNTY IN SOUTHEAST SOUTH DAKOTA

* UNTIL 1230 AM CDT

* AT 1106 PM CDT…NATIONAL WEATHER SERVICE DOPPLER RADAR
INDICATED THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. ONE TO ONE AND ONE HALF INCHES OF RAIN CAN BE EXPECTED AS THUNDERSTORMS MOVE ACROSS THE AREA. THE PRIMARY THREAT FOR FLASH FLOODING WILL BE IN URBANIZED AREA WITH POOR DRAINAGE.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE…SIOUX CITY…DAKOTA CITY…NORTH SIOUX CITY…SERGEANT BLUFF…SOUTH SIOUX CITY AND STONE STATE PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS…URBAN AREAS…HIGHWAYS…STREETS AND UNDERPASSESAS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.