

000 

WWUS20 KWNS 280247

SEL4

SPC WW 280247

ILZ000-INZ000-KYZ000-MOZ000-280900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 764

NWS STORM PREDICTION CENTER NORMAN OK

940 PM CDT SUN JUL 27 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN ILLINOIS

       EXTREME SOUTHWESTERN INDIANA

       WESTERN KENTUCKY

       SOUTHEASTERN MISSOURI



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 940 PM UNTIL

400 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 60

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

VICHY MISSOURI TO 50 MILES NORTHEAST OF PADUCAH KENTUCKY.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU4).



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 762...WW 763...



DISCUSSION...BOW ECHO NEAR STL...WITH WELL ESTABLISHED COLD

POOL...IS EXPECTED TO MOVE SEWD ALONG WEAK BOUNDARY INTO SERN MO/WRN

KY...WITH A CONTINUED DAMAGING WIND THREAT. SUPERCELLS LOCATED WEST

OF THE LINE ARE INGESTING THE STRONGEST INSTABILITY/INFLOW FROM

20-25 KT LOW LEVEL JET. THESE STORMS WILL HAVE A POTENTIAL FOR LARGE

HAIL AND PERIODIC WIND DAMAGE AS THEY MOVE SSEWD OVERNIGHT.



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 550. MEAN STORM

MOTION VECTOR 32040.





...IMY

