MESOSCALE DISCUSSION 0662
   NWS STORM PREDICTION CENTER NORMAN OK
   1049 AM CDT THU APR 28 2011
   
   AREAS AFFECTED...MIDDLE ATLANTIC INTO UPSTATE NY/VT
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 253...
   
   VALID 281549Z - 281645Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 253
   CONTINUES.
   
   NORTHERN EXTENT OF HIGHER INSTABILITY AIRMASS EXTENDS INTO THE LOWER
   HUDSON VALLEY REGION OF NY.  THIS AXIS IS VERY NARROW AND WILL
   STRUGGLE TO SHIFT DOWNSTREAM INTO SRN NEW ENGLAND WHERE LOW LEVEL
   TRAJECTORIES ARE UNFAVORABLY OFF THE COOLER ATLANTIC.  FOR THIS
   REASON IT APPEARS THE GREATEST SEVERE THREAT WILL REMAIN INLAND
   ACROSS SERN PA/NJ INTO EXTREME SRN NY...ESPECIALLY AHEAD OF FAST
   MOVING BOW ECHOES.  ADDITIONALLY...GIVEN THE STRONG SHEAR IT/S NOT
   OUT OF THE QUESTION THAT AN ISOLATED TORNADO MAY BE NOTED WITH THE
   AFOREMENTIONED BOW ECHOES OR SUPERCELL-LIKE STRUCTURES.
   
   ..DARROW.. 04/28/2011
   
   
   ATTN...WFO...BOX...BTV...OKX...ALY...PHI...BGM...CTP...LWX...
   
   LAT...LON   38927623 43997472 43987249 38917418 38927623