MESOSCALE DISCUSSION 1313
   NWS STORM PREDICTION CENTER NORMAN OK
   0630 PM CDT THU JUN 28 2007
   
   AREAS AFFECTED...SRN-SERN PA/NJ/DE/MD/MUCH OF VA/PARTS OF ERN AND
   SERN WV/NRN NC
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 461...
   
   VALID 282330Z - 290030Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 461
   CONTINUES.
   
   ISOLATED STRONG WIND GUSTS AND SOME HAIL REMAIN A THREAT ACROSS THE
   REMAINING PART OF WW 461...WHICH IS S AND SW OF A LINE FROM BEDFORD
   COUNTY PA TO NRN NJ.  GIVEN THAT MUCH OF THE ACTIVITY S OF PA IS
   DIURNALLY DRIVEN...SEVERE WEATHER THREAT MAY BEGIN TO WANE AFTER
   SUNSET.
   
   REGIONAL RADARS INDICATED A BROKEN LINE OF TSTMS EXTENDING SWWD FROM
   THE VICINITY OF NYC THROUGH SERN TO SOUTH CENTRAL PA AND THEN
   THROUGH NRN WV INTO THE OH VALLEY.  ADDITIONAL TSTMS...MORE WIDELY
   SCATTERED...CONTINUE TO DEVELOP S OF THE PRIMARY CONVECTIVE LINE
   FROM SRN WV EWD ACROSS MUCH OF VA AND NRN NC.  MODERATE INSTABILITY
   EXTENDS FROM LONG ISLAND/NJ/FAR SERN PA INTO VA/NC WHICH WILL
   SUPPORT ADDITIONAL TSTM DEVELOPMENT FOR THE NEXT SEVERAL HOURS.
   
   STRONGEST WLY MID LEVEL WINDS EXTEND FROM PA TO SRN NEW ENGLAND
   WHICH SUGGESTS GREATEST SEVERE THREAT DURING THE EARLY EVENING
   SHOULD BE FROM SERN PA/NJ INTO LONG ISLAND WHERE EFFECTIVE BULK
   SHEAR AT 30-35 KT WILL SUPPORT ADDITIONAL STORM ORGANIZATION.  COLD
   POOLS SHOULD ALSO LOCALLY ENHANCE WIND GUST POTENTIAL.
   
   FARTHER S INTO VA...WEAK MID LEVEL WINDS/SHEAR WILL RESULT IN MORE
   PULSE STORMS THROUGH THE EARLY EVENING...WITH GREATEST SEVERE THREAT
   EXPECTED TO BE OVER SERN VA INTO THE DELMARVA WHERE INSTABILITY
   REMAINS MODERATE.
   
   ..PETERS.. 06/28/2007
   
   
   ATTN...WFO...OKX...PHI...AKQ...CTP...LWX...RAH...RNK...PBZ...RLX...GSP...MRX...
   
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