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918 

RWUS32 KDSM 230228

FFSDSM

IAZ004>007-015>017-230900-



FLASH FLOOD STATEMENT

NATIONAL WEATHER SERVICE DES MOINES IA

928 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-- A LINE OF THUNDERSTORMS WILL MOVE ACROSS THE 

AREA OVERNIGHT AND PRODUCE ONE HALF TO THREE QUARTER INCH AVERAGE 

RAINFALL AMOUNTS WITH ISOLATED AMOUNTS NEAR TWO INCHES POSSIBLE.



RECENT REPORTS-- THROUGHOUT THE LATE AFTERNOON AND EVENING 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-- AN AREA OF THUNDERSTORMS MOVING NORTHEAT 

OUT OF KANSAS AND NEBRASKA INTO WESTERN IOWA WILL MOVE INTO THE AREA 

BY AROUND MIDNIGHT.  A LINE OF STRONG TO SEVERE THUNDERSTORMS IS 

EXPECTED TO MOVE QUICKLY THROUGH NORTHERN IOWA. 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.

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