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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 48

NWS STORM PREDICTION CENTER NORMAN OK

130 PM CDT MON APR 5 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHERN IOWA

       NORTHERN MISSOURI



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 130 PM UNTIL 900

PM CDT.



HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES NORTHWEST

OF LAMONI IOWA TO 50 MILES SOUTH SOUTHEAST OF CEDAR RAPIDS IOWA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU8).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH

AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR

THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS

AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



DISCUSSION...SCATTERED ELEVATED THUNDERSTORMS CONTINUE OVER SOUTHERN

IA/NORTHERN MO...WELL NORTH OF SURFACE WARM FRONT.  THESE STORMS ARE

EXPECTED TO PERSIST THROUGH THE REMAINDER OF THE AFTERNOON AND

SPREAD EASTWARD.  ACTIVITY IS CURRENTLY ELEVATED...WITH LARGE HAIL

THE PRIMARY RISK.  BY LATE THIS AFTERNOON...THE RETREATING SURFACE

WARM FRONT WILL MOVE INTO THE WATCH AREA WITH A GREATER RISK OF

SURFACE-BASED STORMS.  PORTIONS OF WATCH AREA MAY NEED TO BE

UPGRADED TO A TORNADO WATCH AT THAT TIME.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 24035.





...HART

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