Mesoscale Discussion 1570
   NWS Storm Prediction Center Norman OK
   0604 PM CDT Sat Jul 23 2022

   Areas affected...parts of central and northern Virginia into
   Maryland and south-central Pennsylvania

   Concerning...Severe Thunderstorm Watch 492...

   Valid 232304Z - 240100Z

   The severe weather threat for Severe Thunderstorm Watch 492
   continues.

   SUMMARY...Isolated damaging gusts or marginal hail remains possible
   within and just east of the watch area for an hour or two.

   DISCUSSION...Storms continue to redevelop along a long-lived outflow
   boundary, periodically indicating marginal hail cores as well as
   wind gust potential. Multiple observations have recently measured
   wind gusts in the 30-40kt range as the line has moved out of WV. 

   The air mass ahead of the surging outflow remains unstable, with
   MLCAPE near 1500 J/kg. While minimal convective inhibition exists,
   and heating has been lost, the surging outflow may continue to
   support sporadic marginally severe storms, whether hail or gusts.

   Given the time of day, and lack of any larger-scale support other
   than the outflow, it appears any severe risk will be isolated
   through evening, and additional watches are not expected. In the
   short term, local extensions may be utilized depending on storm
   trends.

   ..Jewell.. 07/23/2022

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

   ATTN...WFO...AKQ...CTP...LWX...RNK...

   LAT...LON   38967809 39477777 39977760 40287743 40327708 40147670
               39807657 39287658 38827676 38117714 37397785 37267842
               37467881 37687892 37877895 38237856 38607829 38967809