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 45001220Read more
from SPC Forecast Products http://www.spc.noaa.gov/products/md/md1408.html
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