734
ACUS11 KWNS 070549
SWOMCD
SPC MCD 070549
MTZ000-070715-

Mesoscale Discussion 2262
NWS Storm Prediction Center Norman OK
1249 AM CDT Mon Sep 07 2026

Areas affected...portions of north-central Montana

Concerning...Severe Thunderstorm Watch 662...

Valid 070549Z - 070715Z

The severe weather threat for Severe Thunderstorm Watch 662
continues.

SUMMARY...Severe hail and gusts remain possible with several
supercells moving across north-central MT this evening. Storms
should weaken as they move into southern Canada later tonight.

DISCUSSION...A trio of supercells, some relatively intense, ongoing
across Phillips and Fergus counties in north-central MT remain
capable of severe hail and gusts this evening. Relatively moist
conditions with northeasterly surface winds are supporting moderate
elevated buoyancy which will continue to support these storms as
they move northeast at 25-30 kt. Deep-layer shear of 40-50 kt will
continue to favor a supercell storm mode.

As the boundary layer continues to cool, effective parcels will
likely become more elevated. This should gradually weaken the storms
as they approach the international border. However, the environment
remains supportive of severe storms for the next couple of hours.
Severe hail (some approaching 2 inches), and severe gusts are likely
given the organized storm mode and favorable environment.

..Lyons.. 09/07/2026

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

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

LAT...LON   48700880 49020862 49080746 49030696 48930676 48680684
            48130716 47830754 47730777 47570799 47440833 47420851
            47460866 47500887 48210868 48700880

MOST PROBABLE PEAK WIND GUST...55-70 MPH
MOST PROBABLE PEAK HAIL SIZE...1.50-2.50 IN