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Severe Thunderstorm Watch 317
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WW0317 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Moderate
Severe Hail 2"+ Hail
Moderate Low

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL7
   
   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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