New Thunderstorms have developed over the last hour to 90 minutes in the Siouxland area. With already saturated soils from a derecho that moved through earlier this evening, another Flash Flood Warning has been issued. The warning is below.

BULLETIN – EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
212 AM CDT WED JUL 8 2009

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR…
NORTHEASTERN DAKOTA COUNTY IN NORTHEAST NEBRASKA
SOUTHEASTERN UNION COUNTY IN SOUTHEAST SOUTH DAKOTA
SOUTHWESTERN PLYMOUTH COUNTY IN NORTHWEST IOWA
WESTERN WOODBURY COUNTY IN NORTHWEST IOWA

* UNTIL 500 AM CDT

* AT 207 AM CDT…NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS WITH VERY HEAVY RAINFALL EXTENDING FROM NEAR AKRON TO SIOUX CITY AND BRONSON. THESE STORMS WILL CONTINUE TO MOVE ACROSS SOUTHERN UNION…WESTERN PLYMOUTH AND WESTERN WOODBURY COUNTY THROUGH 330 AM CDT. RADAR ESTIMATES OF 1 TO 2 INCHES OF RAINFALL HAVE OCCURRED WITH ANOTHER 1 TO 2 INCHES OF RAINFALL EXPECTED.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE…SIOUX CITY, DAKOTA CITY, HINTON, HORNICK, LAWTON, SALIX, SERGEANT BLUFF, SLOAN, SMITHLAND, SOUTH SIOUX CITY AND STONE STATE PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

DO NOT ATTEMPT TO GO THROUGH FLOODED ROADS. IF A ROAD OR STREET IS FLOODED TURN AROUND AND SEEK AN ALTERNATE ROUTE.