Mesoscale Discussion 1315
   NWS Storm Prediction Center Norman OK
   0218 PM CDT Wed Jul 22 2020

   Areas affected...portions of northeast VA...MD and DE

   Concerning...Severe Thunderstorm Watch 393...

   Valid 221918Z - 222045Z

   The severe weather threat for Severe Thunderstorm Watch 393
   continues.

   SUMMARY...The damaging wind threat may be increasing across
   northeast VA into western MD and areas adjacent to the northern
   Chesapeake Bay vicinity. This includes the I-95 corridor from
   Washington D.C. to Baltimore within the next 1-2 hours.

   DISCUSSION...A cluster of strong to severe thunderstorms will
   continue to shift eastward over the next 1-2 hours, impacting
   portions of the I-95 corridor from Washington D.C. to Baltimore,
   eastward across the northern Chesapeake Bay area to DE. Latest radar
   velocity data from KLWX has shown instances of strong downbursts.
   This cluster of storms will be moving into a strongly unstable
   downstream environment characterized by surface dewpoints from 75-78
   F and MLCAPE as high as 3000 J/kg. Furthermore, latest mesoanalysis
   indicates very steep low level lapse rates around 8 C/km, which will
   enhance damaging wind potential over the next couple of hours.

   ..Leitman.. 07/22/2020

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

   ATTN...WFO...PHI...AKQ...LWX...

   LAT...LON   39407721 39437655 39307609 38307626 38087685 38117741
               38267782 38347795 38457793 39007778 39407721