Mesoscale Discussion 1173
NWS Storm Prediction Center Norman OK
1127 PM CDT Tue Jul 06 2021
Areas affected...Parts of eastern Montana and adjacent northwestern
Concerning...Severe Thunderstorm Watch 339...
Valid 070427Z - 070600Z
The severe weather threat for Severe Thunderstorm Watch 339
SUMMARY...Widely scattered ongoing storms are expected to begin
diminishing within the next couple of hours. Until then, they may
continue to pose a risk for hail and locally strong surface gusts.=20
A new severe weather watch does not appear necessary, but remaining
portions of Severe Thunderstorm Watch 339 could be locally extended
an hour or two.
DISCUSSION...Despite considerable stabilization of low-level lapse
rates to the lee of the northern Rockies. Four widely scattered
supercells have been maintained along a corridor of higher
precipitable water coinciding with weak lower/mid-level warm
advection, from southeastern Saskatchewan into northwestern Wyoming.
This likely has been most prominently supported by the strong
deep-layer shear, and storm-scale dynamic forcing, but seems
unlikely to continue much beyond another hour or two due to the
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