Mesoscale Discussion 1600
   NWS Storm Prediction Center Norman OK
   0535 PM CDT Thu Aug 27 2020

   Areas affected...from central Pennsylvania to Long Island...northern
   Maryland and Delaware

   Concerning...Severe Thunderstorm Watch 457...459...

   Valid 272235Z - 280030Z

   The severe weather threat for Severe Thunderstorm Watch 457, 459
   continues.

   SUMMARY...A line of storms should persist for several more hours as
   it moves across Pennsylvania, and possibly into Maryland, Delaware
   and New Jersey with damaging wind gusts the main threat. Other
   storms may translate south/southwest across Long Island and into
   northern New Jersey.

   DISCUSSION...A line of storms continues to rapidly move
   east/southeast into central PA, with strong wind gusts reported.
   Meanwhile, another zone of storms, some elevated above an outflow
   boundary, persists from southern NY to Long Island.

   In between these two areas of storms, the air mass has become very
   warm with temperatures in the 90s F. Surface analysis indicates a
   theta-e axis roughly from northern VA into NJ, where dewpoints
   remain in the 70s F.

   West/northwest flow aloft and an unstable air mass should allow the
   line of storms over PA to persist, possibly bringing strong wind
   gusts into parts of MD and DE. The zone of storms across NY and Long
   Island, though producing undercutting outflow, may effectively
   translate south/southwest as new updrafts form along and north of
   the outflow boundary. Given the unstable environment over NJ,
   further damaging wind gust may occur as cells train along the
   northwest/southeast oriented outflow-reinforced front.

   ..Jewell.. 08/27/2020

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...OKX...PHI...BGM...CTP...LWX...PBZ...

   LAT...LON   40428025 40377940 40587826 40837765 41097729 40907668
               40787615 40817567 41017518 41257493 41327448 41137383
               40757319 40507311 40437385 39797397 39287421 39047456
               38897542 38937635 39357872 39857980 40178037 40358040
               40428025