ACUS11 KWNS 182335
SWOMCD
SPC MCD 182335
MTZ000-190130-

Mesoscale Discussion 1656
NWS Storm Prediction Center Norman OK
0635 PM CDT Sat Jul 18 2026

Areas affected...Parts of western/central MT

Concerning...Severe Thunderstorm Watch 497...

Valid 182335Z - 190130Z

The severe weather threat for Severe Thunderstorm Watch 497
continues.

SUMMARY...Some increase in severe-wind potential is possible through
the evening. Isolated hail also remains possible.

DISCUSSION...As of 2330 UTC, widely scattered storms are ongoing
across parts of western MT. In the short term, the severe threat may
remain rather isolated, with moderate buoyancy and steep lapse rates
supporting a threat of localized hail and severe gusts. With time,
as both midlevel flow and storm coverage gradually strengthen over
the region, one or more outflow-driven clusters may evolve and pose
an increasing severe-wind threat into this evening. Some severe
threat may eventually develop north of WW 497, and trends will
continue to be monitored regarding the need for local watch
expansion.

..Dean.. 07/18/2026

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fjg!-fi4FpcOYGCL-gfDyPrGWRM0SRPe4gnAH27HxXpu4yC8UApEkOa5RY48HiswX5fakGn0mKkbjPqivaaNFCbujpH-eaA$ for graphic product...

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

LAT...LON 45761352 47971301 48971205 49031139 49061025 49020950
48980903 47650881 46560952 45941010 45511068 45151132
44971202 45101278 45761352

MOST PROBABLE PEAK WIND GUST...65-80 MPH
MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN


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