Mesoscale Discussion 1408
   NWS Storm Prediction Center Norman OK
   0727 PM CDT Sun Jul 07 2019

   Areas affected...MT

   Concerning...Severe Thunderstorm Watch 497...

   Valid 080027Z - 080230Z

   The severe weather threat for Severe Thunderstorm Watch 497
   continues.

   SUMMARY...Isolated severe thunderstorms are expected to continue
   across MT this evening.

   DISCUSSION...Upper ridge will continue to flatten across the
   northern Rockies this evening as heights fall ahead of WA/OR
   short-wave trough. As a result, belt of stronger mid-level flow
   extends across the northern Great Basin-ID-MT-SK and within this
   flow several disturbances are lifting northeast. One such feature is
   located over the Snake River Valley in southern ID. Another weaker
   disturbance may be ejecting across central MT, per recent expanding
   clusters of convection. Over the last hour or so, strong heating
   across northeast WY into southeast MT has contributed to recent
   thunderstorm intensification over Big Horn/Rosebud Counties. This
   activity will soon lift northeast of ww497. Immediate downstream
   counties will likely be added to the watch to account for this
   expanding threat.

   ..Darrow.. 07/08/2019

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

   ATTN...WFO...BYZ...GGW...TFX...

   LAT...LON   45001220 48990944 49000480 45000791 45001220