Mesoscale Discussion 0867
   NWS Storm Prediction Center Norman OK
   0707 PM CDT Tue May 28 2019

   Areas affected...Much of Pennsylvania and New Jersey into northern
   Maryland and Delaware

   Concerning...Tornado Watch 274...

   Valid 290007Z - 290200Z

   The severe weather threat for Tornado Watch 274 continues.

   SUMMARY...The severe threat continues across Tornado Watch 0274 over
   the next few hours, but the threat has been trending downward in
   intensity. Isolated damaging wind gusts and large hail remain
   possible with the more intense, sustained storms. A tornado also
   cannot be ruled out, particularly with the more intense, discrete
   structures in far east Pennsylvania into New Jersey.

   DISCUSSION...Convection persists across much of the southwestern,
   northeastern, and southeastern portions of Tornado Watch 0274.
   Instability has been overall decreasing across the watch area with
   the onset of nocturnal cooling/gradual stabilization of the boundary
   layer. Storms in western Pennsylvania have gusted out within the
   past hour or so, and several of the supercell structures in central
   Pennsylvania have also dissipated (with two supercell structures
   remaining in southern New Jersey, and other supercells in progress
   along the northeast Pennsylvania/northwest New Jersey border).
   Elsewhere, a second band of convection has initiated across northern
   Pennsylvania, but has struggled to intensify given the overturning
   of the airmass from previous storms. 

   A few of the remaining storms may still produce large hail and/or
   damaging wind gusts given that 1000-1500 J/kg MLCAPE remain in place
   amidst a strongly sheared airmass, especially in far east
   Pennsylvania into New Jersey. In addition, strong low-level shear is
   present, and a tornado cannot be ruled out with one of the stronger
   supercells.

   ..Squitieri/Hart.. 05/29/2019

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

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

   LAT...LON   41757879 41797729 41917547 41777473 41157433 40767412
               40217424 39587445 39097489 38757538 38667589 39137625
               39717804 39997984 40248039 40918065 41728032 41757879