Mesoscale Discussion 0378
   NWS Storm Prediction Center Norman OK
   0517 AM CDT Mon Apr 13 2020

   Areas affected...Eastern South Carolina....southeastern Georgia and
   adjacent northern Florida

   Concerning...Tornado Watch 117...

   Valid 131017Z - 131145Z

   The severe weather threat for Tornado Watch 117 continues.

   SUMMARY...A squall line will will overspread the remainder of
   southeastern Georgia and coastal South Carolina through 8-10 AM EDT,
   accompanied by continuing potential for damaging wind gusts and
   tornadoes.

   DISCUSSION...Aided by inflow of moist boundary-layer air (including
   surface dew points around 70 F) with CAPE up to 2000 J/kg, the
   pre-frontal squall line advancing into the south Atlantic coastal
   plain is maintaining considerable strength.  Activity appears
   focused along a low-level confluence zone near the 50-70+ kt 
   southerly 850 mb jet core, where strong to extreme low-level shear
   continues to support the evolution of numerous mesoscale cyclonic
   circulations within the line.  It appears that this may continue
   another couple of hours, accompanied by potential for locally
   enhanced damaging wind gusts and occasional tornadic development.  A
   gradual weakening of the low-level jet is forecast as the convective
   line approaches the northern Florida, Georgia and South Carolina
   coast, with strongest convection probably becoming focused across
   the Myrtle Beach SC vicinity by 13-14Z.

   ..Kerr.. 04/13/2020

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

   ATTN...WFO...ILM...CHS...CAE...JAX...FFC...TAE...

   LAT...LON   30288496 30658425 30918378 31278297 31778257 32428127
               33918051 34437987 34307892 33817862 32707955 30618180
               30178323 30288496