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WWUS20 KWNS 082329

SEL3

SPC WW 082329

INZ000-090400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 673

NWS STORM PREDICTION CENTER NORMAN OK

730 PM EDT TUE JUL 8 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL INDIANA



EFFECTIVE THIS TUESDAY NIGHT FROM 730 PM UNTIL MIDNIGHT EDT.



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 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES NORTHWEST

OF TERRE HAUTE INDIANA TO 40 MILES SOUTH OF MUNCIE INDIANA.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 668...WW 669...WW

670...WW 671...WW 672...



DISCUSSION...MULTIPLE CELL MERGERS IN IL HAVE RESULTED IN THE

FORMATION OF BOWING SEGMENTS AND EWD STORM MOTION OF 45-50 KT.

MODERATE INSTABILITY EXISTS DOWNSTREAM ACROSS INDIANA...WHILE THE

MORE N-S ORIENTATION OF THE STORMS SUGGESTS THAT THE DAMAGING WIND

THREAT WILL LIKELY PERSIST FOR A FEW HOURS ACROSS CENTRAL INDIANA.



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 550. MEAN STORM

MOTION VECTOR 27045.





...THOMPSON

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