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FLASH FLOOD STATEMENT

NATIONAL WEATHER SERVICE DES MOINES IA

336 PM CDT SUN APR 22 2001



WATCH INFORMATION-- A FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 400

AM CDT MONDAY MORNING FOR THE COUNTIES OF CERRO GORDO...EMMET...

HANCOCK...KOSSUTH...PALO ALTO...WINNEBAGO AND WORTH.



SOME CITIES INCLUDED IN THE WATCH ARE ALGONA...ESTHERVILLE AND MASON

CITY.



FORECAST RAINFALL-- SCATTERED THUNDERSTORMS WILL PRODUCE QUARTER 

INCH AVERAGE RAINFALL AMOUNTS EARLY THIS EVENING. A LINE OF 

THUNDERSTORMS LATE THIS EVENING AND OVERNIGHT WILL PRODUCE THREE 

QUARTER INCH AVERAGE RAINFALL AMOUNTS WITH ISOLATED AMOUNTS NEAR TWO 

INCHES POSSIBLE.



RECENT REPORTS-- THROUGHOUT THE AFTERNOON HOURS RAINFALL WAS VERY 

SPOTTY OVER FAR NORTH CENTRAL IOWA. MOST AMOUNTS AVERAGE A TENTH 

INCH OR LESS WITH ISOLATED AMOUNTS AROUND A QUARTER INCH. 



METEOROLOGICAL COMMENTS-- AT APPEARS THE HEAVY RAIN THREAT WILL 

REMAIN OVER FAR NORTHWEST IOWA INTO EASTERN SOUTH DAKOTA AND 

SOUTHERN MINNESOTA. SCATTERED SHOWERS AND THUNDERSTORMS WILL MOVE 

ACROSS NORTH CENTRAL IOWA THROUGH THE EARLY AND MID EVENING HOURS.  

A LINE OF STRONG TO SEVERE THUNDERSTORMS IS EXPECTED TO MOVE QUICKLY 

THROUGH NORTHERN IOWA AFTER 11 PM. DUE TO THE EXPECTED FAST MOVEMENT 

OF THE STORMS...THE WIDESPREAD FLASH FLOOD THREAT HAS DIMINISHED. 

SOME LOCALIZED FLASH FLOODING MAY STILL OCCUR WITH SOME OF THE 

HEAVIER RAINS...MAINLY OVER EXTREME NORTHERN IOWA WHERE SOIL 

MOISTURE CONTENT REMAINS THE HIGHEST.



PRECAUTIONS-- A FLASH FLOOD WATCH MEANS THAT FLOODING OF SMALL 

STREAMS, CREEKS AND OTHER DRAINAGE AREAS IS POSSIBLE WITHIN THE 

WATCH AREA. PEOPLE IN THE WATCH AREA SHOULD KEEP AN EYE ON THE 

WEATHER AND BE PREPARED FOR IMMEDIATE ACTION SHOULD HEAVY RAINS AND 

FLOODING OCCUR OR A FLASH FLOOD WARNING BE ISSUED.



SHOULD HEAVY RAINFALL OCCUR...NEVER DRIVE THROUGH WATER COVERING THE 

ROADWAY. USE CAUTION WHEN APPROACHING DIPS IN THE HIGHWAY OR 

UNDERPASSES.

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