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Severe Thunderstorm Watch 311
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WW0311 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Moderate
Severe Hail 2"+ Hail
Moderate Very 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.
   SEL1
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 311
   NWS STORM PREDICTION CENTER NORMAN OK
   100 PM EDT SAT MAY 16 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          WESTERN AND CENTRAL NEW YORK
          FAR SOUTHEAST OHIO
          WESTERN AND CENTRAL PENNSYLVANIA
          FAR NORTHWEST WEST VIRGINIA
          LAKE ONTARIO
   
   EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 100 PM UNTIL
   800 PM 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 90
   STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES NORTH
   NORTHEAST OF SYRACUSE NEW YORK TO 45 MILES SOUTH SOUTHEAST OF
   LATROBE PENNSYLVANIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE
   THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).
   
   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.
   
   DISCUSSION...THUNDERSTORMS EXPECTED TO INCREASE IN BOTH COVERAGE AND
   INTENSITY ACROSS WW THROUGH LATE TODAY AHEAD OF SURFACE COLD FRONT
   AND STRONG MID/UPPER TROUGH LIFTING ACROSS THE GREAT LAKES.  AIR
   MASS WILL DESTABILIZE SUFFICIENTLY FOR STRONG STORMS...WITH
   SUFFICIENT SHEAR FOR ORGANIZED LINES AND PERHAPS A FEW SUPERCELLS. 
   APPEARS PRIMARY THREAT WILL BE FROM DAMAGING WINDS AND SEVERE
   HAIL...ALTHOUGH STRONG LOW LEVEL SHEAR INTO NRN PA/NY MAY SUPPORT
   ROTATION AND AN ISOLATED TORNADO ACROSS THAT AREA.
   
   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 400. MEAN STORM
   MOTION VECTOR 26030.
   
   
   ...EVANS
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