Mesoscale Discussion 1972
   NWS Storm Prediction Center Norman OK
   1113 PM CDT Wed Aug 21 2024

   Areas affected...eastern Montana/western North Dakota

   Concerning...Severe Thunderstorm Watch 643...

   Valid 220413Z - 220545Z

   The severe weather threat for Severe Thunderstorm Watch 643
   continues.

   SUMMARY...Severe threat continues to gradually diminish across
   eastern Montana/WW 643.

   DISCUSSION...Over the last couple of hours, a noted/gradual decrease
   in convective coverage -- and particularly intensity -- has
   occurred, as the low-level airmass gradually stabilizes.  While
   convection will likely linger over the next couple of hours,
   including a stronger storm or two at times capable of producing
   marginally severe hail and/or wind, new WW issuance is not
   anticipated.  As storms move eastward into North Dakota with time,
   WW 643 will likely be able to be cancelled prior to its scheduled
   22/07Z expiration.

   ..Goss.. 08/22/2024

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

   ATTN...WFO...BIS...UNR...BYZ...GGW...

   LAT...LON   49000430 48990278 47380222 46400279 45890399 46060468
               48000518 49000430