Storm Prediction Center Mesoscale Discussion 1983

   Mesoscale Discussion 1983
   NWS Storm Prediction Center Norman OK
   0604 PM CDT Fri Aug 23 2024

   Areas affected...Western Montana

   Concerning...Severe Thunderstorm Watch 645...

   Valid 232304Z - 240100Z

   The severe weather threat for Severe Thunderstorm Watch 645
   continues.

   SUMMARY...Severe wind gust potential continues with convection this
   evening.

   DISCUSSION...Satellite imagery depicts a well-defined short-wave
   trough, extending from northeast OR-ID-extreme western WY, lifting
   north across the northern Rockies. Large-scale height falls are
   noted ahead of this feature as 500mb flow on the order of 50kt
   translates across the Bitter Roots into western MT. An arcing
   corridor of scattered robust convection has developed ahead of the
   short wave, and while this activity is developing within a
   weak-instability airmass, severe gusts have been common. Over the
   next few hours it appears the primary area of concern will extend
   across northern portions of ww645 where instability has yet to be
   overturned.

   ..Darrow.. 08/23/2024

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

   ATTN...WFO...BYZ...RIW...TFX...PIH...MSO...

   LAT...LON   44641447 48961445 48961029 44651061 44641447