MESOSCALE DISCUSSION 2022
   NWS STORM PREDICTION CENTER NORMAN OK
   0542 PM CDT FRI AUG 19 2011
   
   AREAS AFFECTED...NERN MD...SERN PA...NRN DE...NJ...SERN NY INCLUDING
   PARTS OF LONG ISLAND...WRN CT AND WRN MA
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 791...
   
   VALID 192242Z - 192345Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 791
   CONTINUES.
   
   THREAT PERSISTS FOR BOTH HAIL LOCALLY EXCEEDING SEVERE LEVELS /1
   INCH IN DIAMETER/ AND STRONG WIND GUSTS FROM NERN MD/NRN DE THROUGH
   SERN PA/NJ TO SERN NY TO WRN CT/MA.  COUNTIES LOCATED IN THE WAKE OF
   A BROKEN LINE OF STORMS MOVING EWD THROUGH THE ERN PART OF WW 791
   CAN BE REMOVED FROM THIS WATCH AS THE AIR MASS IS STABILIZING WITH
   WWD EXTENT.
   
   AT 2225Z...REGIONAL RADAR IMAGERY SHOWED A BROKEN LINE OF STORMS
   EXTENDING FROM FAR WRN MA SSWWD THROUGH SERN NY/NRN NJ...SERN PA
   INTO NERN MD.  THE AIR MASS ALONG AND E OF THIS LINE OF ACTIVITY
   REMAINS MODERATELY UNSTABLE...AND GENERALLY WEAKLY SHEARED /SFC-6 KM
   SHEAR AOB 20 KT/.  DESPITE RATHER WEAK WIND FIELDS AND WEAK MIDLEVEL
   LAPSE RATES...A CORRIDOR OF UPPER LEVEL DIVERGENCE EXTENDING FROM
   NRN MD TO NH...AHEAD OF A MIDLEVEL TROUGH TRANSLATING EWD THROUGH
   THE NERN STATES...APPEARS TO BE THE MAIN IMPETUS FOR SUSTAINED
   UPDRAFTS.  THUS...MULTICELL STORMS WILL REMAIN POSSIBLE THROUGH THE
   EARLY EVENING PRIOR TO BOUNDARY LAYER STABILIZATION DUE TO EXISTING
   CONVECTION AND/OR THE LOSS OF DAYTIME HEATING.
   
   ..PETERS.. 08/19/2011
   
   
   ATTN...WFO...BOX...OKX...ALY...PHI...CTP...
   
   LAT...LON   39737614 40467534 41197474 41487408 42047358 42547340
               42737297 42607275 41637278 41057314 40747336 39777417
               39177466 38887536 39237582 39737614