BULLETIN – EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
317 AM CDT FRI JUN 11 2010

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR…
CHEROKEE COUNTY IN NORTHWEST IOWA
EASTERN DAKOTA COUNTY IN NORTHEAST NEBRASKA
NORTHWESTERN IDA COUNTY IN NORTHWEST IOWA
PLYMOUTH COUNTY IN NORTHWEST IOWA
SOUTHEASTERN SIOUX COUNTY IN NORTHWEST IOWA
SOUTHEASTERN UNION COUNTY IN SOUTHEAST SOUTH DAKOTA
WESTERN O’BRIEN COUNTY IN NORTHWEST IOWA
WOODBURY COUNTY IN NORTHWEST IOWA

* UNTIL 630 AM CDT

* AT 314 AM CDT…NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. UPSTREAM ESTIMATES OF RAINFALL FROM 2 TO 3 INCHES…FALLING IN AS SHORT A PERIOD AS AN HOUR…WILL CAUSE FLOODING OF URBAN AND POOR DRAINAGE AREAS.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE…LE MARS…ORANGE CITY…SIOUX CITY…ALTON…ANTHON…ARCHER…BOYDEN…CHEROKEE…CLEGHORN…CORRECTIONVILLE…CRAIG..CUSHING…DAKOTA CITY…DANBURY…GRANVILLE…HINTON…HOLSTEIN…HOSPERS…IRETON…JEFFERSON…KINGSLEY…LARRABEE…LAWTON…MARCUS…MAURICE…MERRILL…MOVILLE…NORTH SIOUX CITY…PAULLINA AND PIERSON.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

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

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. DO NOT ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.