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000 

WWUS20 KWNS 272230

SEL3

SPC WW 272230

ILZ000-MOZ000-280600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 763

NWS STORM PREDICTION CENTER NORMAN OK

525 PM CDT SUN JUL 27 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN ILLINOIS

       NORTHEASTERN MISSOURI



EFFECTIVE THIS SUNDAY AFTERNOON AND MONDAY MORNING FROM 525 PM

UNTIL 100 AM CDT.



HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 110

STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH

NORTHEAST OF KIRKSVILLE MISSOURI TO 35 MILES SOUTHWEST OF SAINT

LOUIS MISSOURI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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...CONTINUE...WW 759...WW 760...WW

761...WW 762...



DISCUSSION...SEVERE STORMS LOCATED IN SRN IA ARE EXPECTED TO

CONSOLIDATE INTO A LINEAR MCS AND MOVE SEWD ALONG A WEAK

BOUNDARY...THAT IS LOCATED ALONG THE MS RIVER IN MO/IL. A DEVELOPING

COLD POOL...ALONG WITH STRONG INSTABILITY AND EFFECTIVE SHEAR NEAR

50 KT...WILL BE MOST SUPPORTIVE OF A DAMAGING WIND THREAT AS THE

SYSTEM MOVES SEWD AT 45 TO 50 MPH.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM

MOTION VECTOR 32045.





...IMY

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