Flooding

Flash Flood Warning (Cherokee and Clay) until 5:30pm

| by Jeff Wilcox

These are actually two different flash flood warnings which were issued minutes apart. The Clay county warning is first with Cherokee county’s below it.

BULLETIN – EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
221 PM CDT WED JUL 7 2010

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR…
CLAY COUNTY IN NORTHWEST IOWA

* UNTIL 530 PM CDT

* AT 214 PM CDT…NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. UP TO AN INCH OF RAIN HAS ALREADY FALLEN NORTHEAST OF SPENCER. MORE THUNDERSTORMS ARE FORMING SOUTHWEST OF SPENCER AND WILL MOVE INTO SPENCER. THIS WILL PRODUCE ANOTHER 1 TO 2 INCHES OF RAIN IN SPENCER AND TO AREAS NORTH OF HIGHWAY 18 NORTHEAST OF SPENCER.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE…SPENCER AND GREENVILLE AND IN AREAS BOUNDED BY HIGHWAY 71 AND HIGHWAY 18 TO THE NORTHEAST OF SPENCER.

BULLETIN – EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
225 PM CDT WED JUL 7 2010

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR…
CHEROKEE COUNTY IN NORTHWEST IOWA

* UNTIL 530 PM CDT

* AT 218 PM CDT…NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. OBSERVERS REPORTED 2 INCHES OF RAIN 2 MILES WEST OF WASHTA. RADAR WAS ALSO INDICATING ONE TO TWO INCHES OVER PORTIONS OF THE AREA. THUNDERSTORMS CONTINUE TO FORM IN WESTERN CHEROKEE COUNTY AND GOING OVER THE AREA THAT HAS ALREADY RECEIVED HEAVY RAIN. ADDITIONAL RAINFALL OF 1 TO 2 INCHES IS EXPECTED.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE…CHEROKEE…CLEGHORN…LARRABEE…QUIMBY AND WASHTA.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

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.