Storm Prediction Center Mesoscale Discussion 1112

   Mesoscale Discussion 1112
   NWS Storm Prediction Center Norman OK
   0619 PM CDT Fri Jun 12 2026

   Areas affected...portions of the Mid-Atlantic...including Washington
   D.C.

   Concerning...Severe Thunderstorm Watch 321...

   Valid 122319Z - 130045Z

   The severe weather threat for Severe Thunderstorm Watch 321
   continues.

   SUMMARY...A gradual decrease in convective intensity and coverage is
   expected through the next 1-2 hours. Some potential for occasional
   damaging wind gusts will continue in the meantime.

   DISCUSSION...Regional radar imagery continues to depicts scattered
   thunderstorms across Severe Thunderstorm Watch 321, with a downburst
   recently producing a measured 58 kt (67 mph) wind gust at Dulles
   airport. Downstream surface observations across southeastern
   Virginia indicate surface temperatures are beginning to cool, with a
   dissipation of boundary layer cumulus also noted on visible
   satellite. As nocturnal cooling/stabilization continues, a gradual
   decrease in convective coverage and intensity is expected over the
   next 1-2 hours. Some potential for occasional damaging wind gusts
   will persist in the near-term, however, with the greatest potential
   likely to accompany any stronger downbursts. A local watch extension
   may be needed, particularly in southeastern Virginia, should a
   stronger storm or two persist after 01z, but a new Severe
   Thunderstorm Watch is not anticipated.

   ..Chalmers.. 06/12/2026

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

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

   LAT...LON   39097751 39107734 39057713 38977694 38847685 38057647
               37827637 37657636 37507649 37437665 37247718 37077803
               37017864 37077920 37147947 37467943 37777916 38337849
               38507824 38987766 39097751 

   MOST PROBABLE PEAK WIND GUST...55-70 MPH