SPC AC 041627
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1127 AM CDT Mon Oct 04 2021
Valid 041630Z - 051200Z
...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS THE
MID-ATLANTIC/DELMARVA...
...SUMMARY...
Strong to locally severe thunderstorms may occur across the
Mid-Atlantic States/Delmarva this afternoon and evening.
...Mid-Atlantic States/Delmarva...
It appears that some strong to marginally severe storms, potentially
capable of localized wind damage, may occur this afternoon and
evening. The region will be cyclonically influenced by the weak
upper low centered over the Ohio Valley/Lower Great Lakes and its
peripheral mid-level cool pocket and modestly strong (20-25 kt)
southwesterly mid-level winds. Latest visible satellite trends
reflect steady clearing especially near/east of the Appalachians
spine across Virginia and Maryland, but also across the
Delmarva/southern New Jersey. MLCAPE values should reach/locally
exceed 1000 J/kg, with weak convergence/differential heating along
the higher terrain/mountains (and front across PA/NJ) expected to
influence thunderstorm development this afternoon. A steepening of
low-level lapse rates and a moist environment could support some
locally strong to severe storms.