Mesoscale Discussion 1394
   NWS Storm Prediction Center Norman OK
   0759 AM CDT Tue Aug 04 2020

   Areas affected...Delaware...New Jersey...far eastern Pennsylvania

   Concerning...Tornado Watch 416...

   Valid 041259Z - 041430Z

   The severe weather threat for Tornado Watch 416 continues.

   SUMMARY...The tornado threat is expected to increase into southern
   New Jersey, northern Delaware, and far eastern Pennsylvania over the
   next 1-3 hours.

   DISCUSSION...An impressive, long-lived arc of supercells just
   north/east of the tropical cyclone track continues to rapidly shift
   north. Supercells with sporadic couplets/tornadoes currently stretch
   from eastern MD/northern DE southeastward, with cells now
   approaching coastal southern NJ.

   The DIX VWP has shown a substantial increase in low-level shear over
   the past couple hours, with 0-1 km SRH quickly approaching 300
   m2/s2. Shear values will likely max-out just before the arcing line
   of storms arrives later this morning. 

   12Z soundings also show impressive low-level CAPE, primarily
   concentrated below 500 mb. Although warming aloft will occur with
   the approach of the tropical cyclone, areas that experience mid-70 F
   dewpoints will maintain a tornado risk.

   ..Jewell.. 08/04/2020

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

   ATTN...WFO...OKX...PHI...

   LAT...LON   38827487 39057524 39257561 39457563 40407504 40537454
               40477399 40317390 39787402 39387424 38827487