THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR…
EASTERN SIOUX COUNTY IN NORTHWEST IOWA
NORTHWESTERN CLAY COUNTY IN NORTHWEST IOWA
O’BRIEN COUNTY IN NORTHWEST IOWA
OSCEOLA COUNTY IN NORTHWEST IOWA
PLYMOUTH COUNTY IN NORTHWEST IOWA
SOUTHEASTERN LYON COUNTY IN NORTHWEST IOWA
WESTERN CHEROKEE COUNTY IN NORTHWEST IOWA
WESTERN DICKINSON COUNTY IN NORTHWEST IOWA
WOODBURY COUNTY IN WEST CENTRAL IOWA

* UNTIL 500 PM CDT

* AT 1101 AM CDT…NATIONAL WEATHER SERVICE DOPPLER RADAR
INDICATED THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED
AREA. ADDITIONAL THUNDERSTORMS WILL CONTINUE TO MOVE OVER THE
WARNED AREA THROUGH THIS AFTERNOON. RAIN WILL BE FALLING ON
ALREADY SATURATED GROUND FROM THE HEAVY RAINS OVER THE
WEEKEND…SO ANY NEW RAINS WILL LEAD TO RAPID RUNOFF AND FLOODING
OF URBAN AREAS AS WELL AS SMALL CREEKS AND STREAMS.

* 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…
ASHTON…BOYDEN…CLEGHORN…GRANVILLE…HARRIS…HARTLEY…
HINTON…HORNICK…HOSPERS…KINGSLEY…LAKE PARK…LAWTON…LITTLE
ROCK…MARCUS…MATLOCK…MAURICE…MELVIN…MERRILL…MOVILLE…
OCHEYEDAN…PAULLINA…PIERSON…PRIMGHAR AND REMSEN.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

TOTAL ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 ARE POSSIBLE IN THE
WARNED AREA. RAINFALL RATES OF 2 TO 4 INCHES PER HOUR COULD EXIST
FOR 20 TO 30 MINUTES WHICH WILL LEAD TO RAPID RUNOFF CAUSING STREET
FLOODING IN URBAN AREAS AND RAPID RISES ON SMALLER CREEKS AND
STREAMS.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS…HIGHWAYS AND UNDERPASSES. ADDITIONALLY…COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS…STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.