

909 

WWUS20 KWNS 132159

SEL7

SPC WW 132159

INZ000-140500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 777

NWS STORM PREDICTION CENTER NORMAN OK

600 PM EDT SAT AUG 13 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHERN INDIANA



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 600 PM

UNTIL 100 AM EDT.



HAIL TO 1 INCH 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 50

STATUTE MILES EITHER SIDE OF A LINE FROM 15 MILES SOUTHWEST OF

TERRE HAUTE INDIANA TO 25 MILES SOUTH SOUTHEAST 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...CONTINUE...WW 775...WW 776...



DISCUSSION...BROKEN PRE-FRONTAL SQUALL LINE CONTINUES TO TRACK

EAST-SOUTHEAST INTO CENTRAL IL AND WILL MOVE INTO PARTS OF CENTRAL

INDIANA IN THE NEXT COUPLE OF HOURS. SHEAR AND INSTABILITY ACROSS

THE REGION WILL CONTINUE TO SUPPORT BOWING LINE SEGMENTS AND A

COUPLE OR SUPERCELLS WITH HAIL AND HIGH WINDS POSSIBLE. TAIL-END

STORMS CURRENTLY ACROSS CENTRAL IL WILL TAKE A LITTLE LONGER TO

TRACK SEWD INTO SECTIONS OF SW IND LATER TODAY BUT COULD REMAIN A

THREAT FOR SEVERE WELL AFTER DARK GIVEN THE POSSIBLE ENHNCMNT FROM

THE LARGER SCALE TROUGH AMPLIFICATION BEING FORECAST ACROSS THE

MIDWEST.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM MOTION

VECTOR 29025.





...CARBIN

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