MESOSCALE DISCUSSION 2009
   NWS STORM PREDICTION CENTER NORMAN OK
   0146 AM CDT FRI SEP 11 2009
   
   AREAS AFFECTED...COASTAL PORTIONS OF DE/NJ
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 110646Z - 110915Z
   
   ISOLATED TORNADO THREAT SPREADING ONSHORE OVER THE NEXT SEVERAL
   HOURS MAY REQUIRE WW ISSUANCE.
   
   LATEST SURFACE ANALYSIS SHOWS A SURFACE LOW JUST E OF THE DELMARVA
   PENINSULA...MOVING SLOWLY NWWD TOWARD THE COAST PER LATEST SATELLITE
   AND RADAR DATA.  WHILE THE LOW SHOULD REMAIN JUST OFFSHORE THROUGH
   SUNRISE...A MOIST BOUNDARY LAYER CONTINUES ADVECTING WWD/INLAND JUST
   TO THE N OF THE LOW CENTER -- I.E. FROM COASTAL PORTIONS OF DE AND
   MD NWD.  WHILE ONSHORE INSTABILITY REMAINS LIMITED AT BEST
   ATTM...LIGHTNING IS NOW APPROACHING THE SRN NJ COAST REVEALING THE
   ONGOING WWD ADVECTION OF A MORE MOIST/UNSTABLE AIRMASS.  
   
   AREA VAD WIND PROFILES REVEAL STRONGLY VEERING/INCREASING FLOW WITH
   HEIGHT THROUGH THE LOWEST COUPLE OF KM...WITH LARGE LOOPING
   HODOGRAPHS AND 0-1 KM SHEAR IN EXCESS OF 30 TO 35 KT OBSERVED BY
   BOTH THE DOVER AFB AND THE FORT DIX RADARS SUPPORTIVE OF LOW-LEVEL
   ROTATION.  INDEED...SEVERAL OF THE STRONGER CELLS OFFSHORE HAVE
   REVEALED AT LEAST TRANSIENT ROTATION...AND WITH THE ONGOING INLAND
   MOISTENING/DESTABILIZATION...AN INCREASE IN TORNADO POTENTIAL IS
   EXPECTED ONSHORE OVER THE NEXT SEVERAL HOURS.
   
   ..GOSS.. 09/11/2009
   
   
   ATTN...WFO...PHI...AKQ...
   
   LAT...LON   38287500 38947552 39297540 40407448 40327391 39607390
               38607442 38287500