

000 

WWUS20 KWNS 310259

SEL7

SPC WW 310259

ILZ000-INZ000-MOZ000-310800-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 397

NWS STORM PREDICTION CENTER NORMAN OK

1000 PM CDT FRI MAY 30 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTH CENTRAL ILLINOIS

       SOUTH CENTRAL INDIANA

       CENTRAL MISSOURI



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1000 PM

UNTIL 300 AM CDT.



HAIL TO 1.5 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 40

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

NORTHWEST OF SPRINGFIELD MISSOURI TO 35 MILES SOUTH OF MUNCIE

INDIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 394...TORNADO WATCH NUMBER 395. WATCH NUMBER

394 395 WILL NOT BE IN EFFECT AFTER 1000 PM CDT.



DISCUSSION...BROKEN BAND OF SEVERE STORMS WILL CONTINUE TO SAG SEWD

ACROSS MO/IL/INDIANA OVERNIGHT.  A GRADUAL REDUCTION OF INSTABILITY

WILL LEAD TO SLOW WEAKENING OF THE CONVECTION BY THE EARLY MORNING

HOURS.  IN THE MEANTIME...INSTABILITY AND DEEP LAYER VERTICAL SHEAR

WILL REMAIN SUFFICIENT FOR EMBEDDED BOW/SUPERCELL STRUCTURES...WITH

AN ATTENDANT THREAT FOR DAMAGING WINDS AND LARGE HAIL.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 27035.





...THOMPSON

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