WATCHES: Severe Thunderstorm Watch Number 317

WWUS20 KWNS 302332
SEL7
SPC WW 302332
INZ000-OHZ000-310600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 317
NWS STORM PREDICTION CENTER NORMAN OK
730 PM EDT SAT MAY 30 2009

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

CENTRAL INDIANA
SOUTHWEST OHIO

EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 730 PM
UNTIL 200 AM EDT.

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 45
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES WEST OF
LAFAYETTE INDIANA TO 70 MILES EAST SOUTHEAST OF DAYTON OHIO. 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 316...

DISCUSSION...THUNDERSTORMS INCREASING COINCIDENT WITH WEAK FRONTAL
WAVE DEVELOPMENT ACROSS IL/IND BORDER ATTM. THIS ACTIVITY APPEARS TO
BE FOCUSED ALONG AND NORTH OF RESIDUAL FRONTAL ZONE EXTENDING NWWD
FROM THE OH RIVER TO THE FRONTAL WAVE/LOW. UNSTABLE WARM SECTOR
SHOULD CONTINUE TO FUEL VIGOROUS STORM UPDRAFTS WITHIN STRONGLY
SHEARED REGIME. PRIMARILY UNIDIRECTIONAL FLOW HAS ALREADY LED TO
NUMEROUS STORM SPLITS WITH BOTH RIGHT AND LEFT MOVERS FAVORED FOR
PERSISTENCE AND LARGE HAIL PRODUCTION. LARGER/UPSCALE ORGANIZATION
INTO SMALL MCS POSSIBLE GIVEN INFLUENCE OF DEVELOPING FRONTAL WAVE
CIRCULATION. STRONG NW FLOW COULD SUPPORT AN INCREASE IN MORE
WIDESPREAD DAMAGING WINDS IF STORM MERGERS LEAD TO MCS DEVELOPMENT
INTO THE EVENING.

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 450. MEAN STORM
MOTION VECTOR 32030.

...CARBIN

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