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Severe Thunderstorm Watch 249
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WW0249 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Moderate
Severe Hail 2"+ Hail
Low 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.
   SEL9
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 249
   NWS STORM PREDICTION CENTER NORMAN OK
   405 AM EDT THU APR 28 2011
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          DELAWARE
          NORTHEAST MARYLAND
          WEST AND SOUTHWEST NEW JERSEY
          PARTS OF CENTRAL INTO SOUTHEAST NEW YORK
          EASTERN PENNSYLVANIA
          COASTAL WATERS
   
   EFFECTIVE THIS THURSDAY MORNING FROM 405 AM UNTIL 1000 AM EDT.
   
   HAIL TO 1 INCH 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 EAST AND WEST OF A LINE FROM 40 MILES NORTHEAST OF
   UTICA NEW YORK TO 30 MILES SOUTHWEST OF DOVER DELAWARE.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
   UPDATE (WOUS64 KWNS WOU9).
   
   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...THIS SEVERE THUNDERSTORM WATCH REPLACES
   SEVERE THUNDERSTORM WATCH NUMBER 244. WATCH NUMBER 244 WILL NOT
   BE IN EFFECT AFTER 405 AM EDT. CONTINUE...WW 246...WW 247...WW
   248...
   
   DISCUSSION...BROKEN BAND OF PRE-FRONTAL CONVECTION WILL PERSIST
   THROUGH THE MORNING ACROSS ERN PA INTO NY IN ADVANCE OF A STRONG
   MIDLEVEL TROUGH PIVOTING NEWD OVER THE OH VALLEY.  STRONG WIND
   PROFILES WILL REMAIN IN PLACE ACROSS THE WATCH AREA...WHILE SURFACE
   TEMPERATURES AOA 70 F AND DEWPOINTS IN THE MID-UPPER 60S WILL
   MAINTAIN SURFACE-BASED INSTABILITY.  DAMAGING WINDS WILL BE THE
   PRIMARY THREAT WILL EMBEDDED BOWS...THOUGH AN ISOLATED TORNADO
   CANNOT BE RULED OUT WITH EMBEDDED CIRCULATIONS.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.
   A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION
   VECTOR 22045.
   
   
   ...THOMPSON
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Page last modified: April 28, 2011
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