

000 

WGUS73 KFSD 210644

FFSFSD



FLASH FLOOD STATEMENT

NATIONAL WEATHER SERVICE SIOUX FALLS SD

139 AM CDT MON JUL 21 2008



IAC149-193-NEC043-051-SDC027-127-211115-

/O.CON.KFSD.FF.W.0025.000000T0000Z-080721T1115Z/

/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

PLYMOUTH IA-WOODBURY IA-DAKOTA NE-DIXON NE-UNION SD-CLAY SD-

139 AM CDT MON JUL 21 2008



...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 AM CDT FOR

SOUTHEASTERN CLAY...SOUTHERN UNION...DIXON...DAKOTA...WOODBURY AND

SOUTHERN PLYMOUTH COUNTIES...



AT 139 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO

INDICATE A THUNDERSTORM PRODUCING FLASH FLOODING.  THIS STORM WAS

LOCATED NEAR SALIX..MOVING EAST AT 51 MPH.



RADAR ESTIMATED UP TO 3 INCHES OF RAIN HAS ALREADY FALLEN FROM 

NORTHERN DAKOTA COUNTY...TO AREAS FROM SIOUX CITY TO SARGEANT

BLUFF AND LAWTON. ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE 

POSSIBLE IN EASTERN WOODBURY COUNTY. OTHER AREAS SHOULD SEE AN 

ADDITIONAL HALF INCH OR LESS. 



EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL

CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES

AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.



AT 1225 AM CDT...A STORM SPOTTER REPORTED A FLASH FLOOD IN NORTH 

SIOUX CITY.



BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE

DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE

UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS

SUBJECT TO FLOODING WHEN WATER BEGINS RISING.



FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE

YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME

KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR

CREEKS.



TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY

YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN SIOUX

FALLS.



A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 AM CDT MONDAY

MORNING FOR NORTHWEST IOWA AND NORTHEAST NEBRASKA AND SOUTHEASTERN

SOUTH DAKOTA.



LAT...LON 4227 9632 4227 9635 4226 9701 4277 9700

      4276 9588 4256 9590 4256 9577 4222 9568

      4222 9633



$$

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