MESOSCALE DISCUSSION 1090
   NWS STORM PREDICTION CENTER NORMAN OK
   0524 PM CDT SAT JUN 20 2015

   AREAS AFFECTED...SRN/ERN PA...MD...MUCH OF VA...NRN NC...DE...NJ

   CONCERNING...SEVERE THUNDERSTORM WATCH 317...318...

   VALID 202224Z - 210000Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
   317...318...CONTINUES.

   SUMMARY...PARTS OF SERN PA...NJ...DE...AND ERN MD ARE BEING
   MONITORED FOR A POSSIBLE NEW WATCH. MEANWHILE...PRIMARY THREAT OF
   DMGG WIND GUSTS CONTINUES WITHIN SVR TSTM WATCHES 317 AND 318 OVER
   THE MID-ATLANTIC INTO NRN NC.

   DISCUSSION...RADAR MOSAIC SHOWS SMALL LINE SEGMENTS DEVELOPING
   ALONG/AHEAD OF MAIN CONFLUENCE LINE ACCOMPANYING SFC LOW MOVING
   ACROSS ERN WV. MORE ISOLATED/DISCRETE DEVELOPMENT IS OCCURRING
   FARTHER E FROM NRN VA INTO ERN MD...INVOF A DIFFUSE WARM FRONT
   DRAPED ACROSS SRN PA INTO SRN NJ. THE WIND THREAT SHOULD REMAIN
   DOMINANT WITHIN MUCH OF THE WARM SECTOR ACROSS VA INTO NRN
   NC...GIVEN PREFERRED STORM MODE OF SMALL LINE SEGMENTS AND
   SLY/GRADUALLY VEERING LOW-LEVEL FLOW OBSERVED IN REGIONAL VWP DATA.
   HOWEVER...A TORNADO THREAT CANNOT BE RULED OUT WITH DISCRETE TSTMS
   INTERACTING WITH THE WARM FRONT WHERE SFC WINDS ARE EXHIBITING A
   MORE ELY COMPONENT. 

   DMGG WIND AND WEAK TORNADO THREAT COULD EXTEND TO THE E OF SVR TSTM
   WATCH 317 OVER THE NEXT COUPLE HRS AS THE WARM FRONT ADVANCES
   NWD...BUT RECENT CONVECTIVE TRENDS SHOW ONGOING TSTMS MOVING INTO
   NRN DE ARE STRUGGLING TO MAINTAIN INTENSITY. HOWEVER...CONVECTIVE
   TRENDS WILL CONTINUE TO BE MONITORED FOR A NEW POSSIBLE WW...WHICH
   MAY INCLUDE PARTS OF SERN PA...NJ...DE...AND ERN MD.

   ..ROGERS/HART.. 06/20/2015


   ATTN...WFO...PHI...AKQ...MHX...CTP...LWX...RAH...RNK...PBZ...
   RLX...GSP...

   LAT...LON   38317557 36287633 35527952 35458027 37327967 39557996
               40837944 40667623 40577453 39637395 38827505 38317557