

892 

WWUS20 KWNS 100043

SEL9

SPC WW 100043

ILZ000-INZ000-100700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 569

NWS STORM PREDICTION CENTER NORMAN OK

740 PM CDT THU AUG 9 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND EASTERN ILLINOIS

       CENTRAL AND SOUTHERN INDIANA



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 740 PM

UNTIL 200 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 70

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 10 MILES NORTHWEST

OF DECATUR ILLINOIS TO 35 MILES SOUTH SOUTHEAST OF MUNCIE

INDIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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

SEVERE THUNDERSTORM WATCH NUMBER 568. WATCH NUMBER 568 WILL NOT

BE IN EFFECT AFTER 740 PM CDT. CONTINUE...WW 567...



DISCUSSION...SCTD AREAS OF TSTMS EXPECTED TO CONTINUE FORMING

THROUGH AT LEAST LATE EVE IN WW AREA...IN ZONE OF INCREASING MID LVL

COOLING AND ASCENT DOWNSTREAM FROM SHORTWAVE TROUGH NOW AMPLIFYING

SEWD FROM ERN IA.  AMPLE DEEP SHEAR WILL BE PRESENT FOR SUSTAINED

STORMS AND POSSIBLY SPLITTING SUPERCELLS WITH SVR HAIL/WIND.  AN

ISOLD TORNADO CANNOT BE RULED OUT...ESPECIALLY ALONG STALLING W-E

OUTFLOW IN N CNTRL IND...BUT ANY SUCH THREAT SHOULD BE SHORT-LIVED.



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 30025.





...CORFIDI

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