MESOSCALE DISCUSSION 1738
   NWS STORM PREDICTION CENTER NORMAN OK
   0334 PM CDT FRI JUL 31 2009
   
   AREAS AFFECTED...MID-ATLC FROM NRN VA NEWD TO CT
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 644...
   
   VALID 312034Z - 312200Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 644
   CONTINUES.
   
   MODEST PRESSURE FALL AXIS EXTENDS ACROSS LWR ERN MD NWD INTO CNTRL
   NJ AND THE MESOSCALE LOW NEAR KPHL SHOULD TRACK ENE ALONG THE
   EMERGING OUTFLOW INTO THE PRESSURE FALLS INTO CNTRL NJ THROUGH 22Z. 
   BOWS AND BRIEF SUPERCELL STRUCTURES AHEAD OF THIS FEATURE WILL
   CONTINUE TO OFFER THE HIGHEST SVR THREATS DOWNSTREAM ACROSS DE INTO
   CNTRL/SRN NJ.  HERE...MLCAPES OF 2000 J/KG WILL SUPPORT VIGOROUS
   UPDRAFTS AND PRESENCE OF AROUND 175 M2/S2 OF 0-1KM SRH MAY BE
   SUFFICIENT FOR DISCRETE CELLS AHEAD OF THE BOWS TO PRODUCE A BRIEF
   TORNADO.
   
   ELSEWHERE...LINEAR STORMS CONTINUE TO EVOLVE ALONG NRN REACHES OF
   THE OUTFLOW BOUNDARY ACROSS CNTRL/SRN NEW ENGLAND WHERE AIR MASS
   HEATED INTO THE MID AND UPR 70S TODAY.  SIMILAR TO THEIR
   COUNTERPARTS TO THE SOUTH...STORMS IN THIS CORRIDOR MAY PRODUCE DMGG
   WIND GUSTS/ISOLD TORNADO...PARTICULARLY SOUTH OF THE MASS TURNPIKE
   AND SE OF A LINE FROM KBOS TO KHVN LINE.
   
   ..RACY.. 07/31/2009
   
   
   ATTN...WFO...BOX...OKX...PHI...AKQ...LWX...
   
   LAT...LON   38537727 39567581 40927368 41797258 41817201 41317188
               40787199 40477305 40137364 39177425 38637480 38457532
               38777601 38297636 38277691 38537727