BULLETIN – EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1125 PM CDT WED JUL 21 2010

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR…
CLAY COUNTY IN SOUTHEAST SOUTH DAKOTA
NORTHERN DIXON COUNTY IN NORTHEAST NEBRASKA
PLYMOUTH COUNTY IN NORTHWEST IOWA
SIOUX COUNTY IN NORTHWEST IOWA
SOUTHEASTERN TURNER COUNTY IN SOUTHEAST SOUTH DAKOTA
SOUTHERN LINCOLN COUNTY IN SOUTHEAST SOUTH DAKOTA
UNION COUNTY IN SOUTHEAST SOUTH DAKOTA
YANKTON COUNTY IN SOUTHEAST SOUTH DAKOTA

* UNTIL 830 AM CDT THURSDAY

* AT 1119 PM CDT…NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. RAINFALL AMOUNTS OVER PARTS OF SOUTH DAKOTA HAVE NEAR INTERSTATE 90 HAVE RANGED FROM 2 TO 4 INCHES OF RAIN AND SIMILAR THUNDERSTORM ACTIVITY IS EXPECTED FROM YANKTON TO VERMILLION TO ROCK VALLEY AND SIOUX CENTER.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE…BERESFORD…HAWARDEN…LE MARS…ORANGE CITY…VERMILLION…YANKTON…AKRON…ALCESTER…ALTON…BOYDEN…CENTERVILLE…CRAIG…ELK POINT…FAIRVIEW…GRANVILLE…HINTON…HOSPERS…HUDSON…HULL…IRENE…IRETON…KINGSLEY…LEWIS AND CLARK STATE RECREATION AREA…MASKELL…MATLOCK…MAURICE…MAYFIELD…MECKLING…
MERRILL AND MISSION HILL.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

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.

FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER COVERED BRIDGES…DIPS…OR LOW WATER CROSSINGS. NEVER TRY TO CROSS A FLOWING STREAM…EVEN A SMALL ONE…ON FOOT OR IN A VEHICLE.