

253 

RWUS42 KDSM 090212

FFSDSM

IAZ034>039-045>050-057>062-070>075-081>086-092>097-090900-



FLASH FLOOD STATEMENT

NATIONAL WEATHER SERVICE DES MOINES IA

910 PM CDT SUN APR 8 2001



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

AM CDT MONDAY MORNING FOR THE COUNTIES OF 

ADAIR...ADAMS...APPANOOSE...AUDUBON...BLACK 

HAWK...BOONE...CALHOUN...CARROLL...CASS...CLARKE...DALLAS...DAVIS...D

ECATUR...GREENE...GRUNDY...GUTHRIE...HAMILTON...HARDIN...JASPER...LUC

AS...MADISON...MAHASKA...MARION...MARSHALL...MONROE...POLK...POWESHIE

K...RINGGOLD...STORY...TAMA...TAYLOR...UNION...WAPELLO...WARREN...WAY

NE AND WEBSTER.



SOME CITIES IN THE WATCH INCLUDE AMES...ATLANTIC...BOONE...CARROLL...

CENTERVILLE...CHARITON...CRESTON...DES MOINES...FORT DODGE...

GRINNELL...INDIANOLA...IOWA FALLS...KNOXVILLE...LAMONI...

MARSHALLTOWN...NEWTON...OSKALOOSA...OTTUMWA...PELLA...PERRY...

WATERLOO AND WEBSTER CITY.



FORECAST RAINFALL--ISOLATED 1 TO 3 INCH AMOUNTS ARE POSSIBLE IN 

HEAVIER STORMS.



RECENT REPORTS--DOPPLER RADAR ESTIMATES NOW INDICATE THAT OVER AN 

INCH OF RAIN MAY HAVE FALLEN OVER NORTHERN JASPER COUNTY...CENTRAL 

TAMA COUNTY AND PARTS OF POLK COUNTY. WSR-88D RADAR NOW ESTIMATES 

THAT UP TO TWO INCHES OF RAIN HAS FALLEN OVER SOUTHEAST TAYLOR 

COUNTY AND THE HEAVIER RAINS ARE NOW MOVING INTO RINGGOLD COUNTY.



METEOROLOGICAL COMMENTS--A SLOW MOVING FRONTAL BOUNDARY LOCATED 

APPROXIMATELY ALONG HIGHWAY 80 IN CENTRAL IOWA IS ACTING AS THE 

FOCUS FOR SEVERE THUNDERSTORM DEVELOPMENT AND HEAVY RAINFALL OVER 

PARTS OF CENTRAL AND SOUTHERN IOWA. CONTINUED DEVELOPMENT ALONG THIS 

BOUNDARY MAY CAUSE FLASH FLOOD GUIDANCE NUMBERS TO BE EXCEEDED AND 

RESULT IN URBAN FLOODING AND SMALL CREEKS AND STREAMS TO FLOOD. 

THUNDERSTORM CELLS ARE MOVING QUICKLY BUT RENEWED DEVELOPMENT TO THE 

SOUTHWEST MAY CAUSE STORM CELLS TO MOVE OVER ALREADY SATURATED 

GROUND.



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.



$$



PC

