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   Mesoscale Discussion 1802
   NWS Storm Prediction Center Norman OK
   0942 PM CDT Sat Jul 26 2025

   Areas affected...Northeast Montana

   Concerning...Severe Thunderstorm Watch 545...

   Valid 270242Z - 270415Z

   The severe weather threat for Severe Thunderstorm Watch 545
   continues.

   SUMMARY...A localized corridor of significant (70-85 mph) winds may
   be emerging across northeast Montana for the next hour or so.

   DISCUSSION...KGGW velocity imagery shows a localized surge in a
   maturing MCS that is the result of a recent squall-line/supercell
   merger. This merger is likely the initiating mechanism for a
   somewhat prolonged (1-2 hour) surge of severe - to potentially
   significant - wind gusts downstream across northeast MT. Recent
   observations from the 00 UTC GGW sounding and the KGGW VWP show very
   steep mid-level lapse rates and favorable deep-layer wind shear for
   MCS maintenance, including very strong 0-3 km BWD values on the
   order of 40 knots. Consequently, given this environment and the
   recent convective trends, the potential for wind gusts as high as
   70-85 mph appears to be increasing.

   ..Moore.. 07/27/2025

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

   ATTN...WFO...GGW...

   LAT...LON   47450749 47650755 47960763 48120761 48690577 48630534
               48490507 48160488 47950490 47780497 47650506 47600533
               47450749 

   MOST PROBABLE PEAK WIND GUST...65-80 MPH