BULLETIN – EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
918 PM CDT MON JUN 20 2011

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR…
DAKOTA COUNTY IN NORTHEAST NEBRASKA
NORTHWESTERN WOODBURY COUNTY IN WEST CENTRAL IOWA
SOUTHERN LINCOLN COUNTY IN SOUTHEAST SOUTH DAKOTA
SOUTHWESTERN SIOUX COUNTY IN NORTHWEST IOWA
UNION COUNTY IN SOUTHEAST SOUTH DAKOTA
WESTERN PLYMOUTH COUNTY IN NORTHWEST IOWA

* UNTIL 1130 PM CDT

* AT 911 PM CDT…NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA.
RAINFALL ESTIMATES OF 2 TO 3 INCHES WERE COMMON IN WESTERN DAKOTA
COUNTY.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE…
BERESFORD…HAWARDEN…SIOUX CITY…AKRON…ALCESTER…CRAIG…
DAKOTA CITY…ELK POINT…HINTON…HOMER…HUBBARD…HUDSON…
IRETON…JACKSON…JEFFERSON…MERRILL…NORTH SIOUX CITY…
SALIX…SERGEANT BLUFF…SOUTH SIOUX CITY AND STONE STATE PARK.

A LINE OF THUNDERSTORMS WILL BE MOVING NORTHWARD ACROSS THE LOWER
BIG SIOUX VALLEY AREA PRODUCING WIDESPREAD 1 TO 3 INCH RAINFALL
AMOUNTS OVER THE NEXT 1 TO 2 HOURS.

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.