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081 

WWUS20 KWNS 060341

SEL2

SPC WW 060341

IAZ000-MOZ000-NEZ000-061000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 52

NWS STORM PREDICTION CENTER NORMAN OK

1040 PM CDT MON APR 5 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       LARGE PART OF SOUTHERN IOWA

       SMALL PART OF NORTHWEST MISSOURI

       PARTS OF SOUTHEAST NEBRASKA



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 1040 PM

UNTIL 500 AM CDT.



HAIL TO 2 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 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES WEST

SOUTHWEST OF LINCOLN NEBRASKA TO 30 MILES NORTH NORTHEAST OF

OTTUMWA IOWA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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.



OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES

TORNADO WATCH NUMBER 51. WATCH NUMBER 51 WILL NOT BE IN EFFECT

AFTER 1040 PM CDT.



DISCUSSION...SUPERCELLS HAVE WEAKENED AS STORMS HAVE BECOME ELEVATED

WITH LOSS OF SURFACE HEATING .  STRONG WARM ADVECTION ACROSS THE

WARM FRONT EXPECTED TO MAINTAIN THREAT OF STRONG/SEVERE

THUNDERSTORMS NEXT SEVERAL HOURS SHIFTING NWD WITH THE WARM FRONT.

PRIMARY THREAT WILL BE LARGE HAIL.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 24030.





...HALES

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