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Severe Thunderstorm Watch 587
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WW0587 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 587
   NWS STORM PREDICTION CENTER NORMAN OK
   140 PM EDT THU JUL 16 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          EXTREME NORTHWEST CONNECTICUT
          EXTREME WESTERN MASSACHUSETTS
          CENTRAL AND EASTERN NEW YORK
          EXTREME NORTHEAST PENNSYLVANIA
          WESTERN VERMONT
   
   EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 140 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 65
   STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTH OF
   SARANAC LAKE NEW YORK TO 25 MILES WEST OF POUGHKEEPSIE NEW YORK. 
   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.
   
   DISCUSSION...SCATTERED THUNDERSTORMS ARE DEVELOPING IN CENTRAL NY
   NEAR THE INTERSECTION OF A DIFFUSE COLD FRONT AND THE LAKE BREEZE
   ALONG THE S SHORE OF LAKE ONTARIO...WHILE ADDITIONAL DEVELOPMENT IS
   EXPECTED THIS AFTERNOON BOTH N AND S OF THIS AREA ALONG THE FRONT. 
   SURFACE TEMPERATURES ARE WARMING INTO THE UPPER 70S TO LOWER 80S
   WITH DEWPOINTS IN THE MID 60S...RESULTING IN MLCAPE VALUES OF
   1000-1500 J/KG.  SUBTLE MID LEVEL SPEED MAXIMA WILL CROSS THIS AREA
   NEAR THE FRONT DURING THE AFTERNOON AND CONTRIBUTE TO AN ENVIRONMENT
   OF DEEP WLY BULK SHEAR OF 35-40 KT...WHICH WILL BE SUFFICIENT FOR
   ORGANIZED STORMS/SUPERCELLS...ESPECIALLY WHERE SHEAR IS ENHANCED
   SOME BY TERRAIN-INDUCED LOW-LEVEL SLY FLOW.  A FEW DAMAGING GUSTS
   AND MARGINALLY SEVERE HAIL WILL BE THE MAIN THREATS THROUGH THE
   AFTERNOON/EVENING.
   
   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 500. MEAN STORM
   MOTION VECTOR 27025.
   
   
   ...THOMPSON
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