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SPC WW 211025
ILZ000-MOZ000-211600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 135
STORM PREDICTION CENTER NORMAN OK
525 AM CDT SUN APR 21 2002

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   SOUTHWEST ILLINOIS                           
   CENTRAL AND EASTERN MISSOURI                           

EFFECTIVE THIS SUNDAY MORNING FROM 530 AM UNTIL 1100 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 ALONG AND 100 STATUTE MILES
EAST AND WEST OF A LINE FROM 55 MILES EAST SOUTHEAST OF FORT
LEONARD WOOD MISSOURI TO 45 MILES NORTHWEST OF ALTON ILLINOIS.

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 134...

DISCUSSION...CNTRL MO LINEAR MCS EXPECTED TO CONTINUE EWD AHEAD OF
LEADING EDGE OF HEIGHT FALLS ASSOCIATED WITH ERN NEB SHORTWAVE
TROUGH.  MOST OF THE ACTIVITY SHOULD REMAIN SLIGHTLY ELEVATED...
WITH AREA OF STRONGEST STORM DEVELOPMENT REMAINING NEAR
INTERSECTION OF MCS WITH FRONT STALLED W/E ACROSS SRN MO.  DEEP
SHEAR SUFFICIENT FOR SUPERCELLS...ESPECIALLY IN IMMEDIATE VICINITY
OF FRONT.  

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 450.  MEAN STORM
MOTION VECTOR 26040.

...CORFIDI

;392,0884 372,0892 372,0930 392,0923;

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WWUS20 KWNS 211032
SEL5  
SPC WW 211025
ILZ000-MOZ000-211600-