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This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.

DISCUSSION

KEY MESSAGES:

1) Look for milder temperatures across NE Montana over the next couple of days, though with a sharp gradient.

2) Upper ridging over the Rocky Mountains this week will maintain mostly dry weather conditions.

WEATHER PATTERN OVERVIEW:

A large and high amplitude ridge over the western U.S. and centered over the Rockies will dominate weather conditions across NE Montana through Saturday. Look for mostly dry weather conditions with either near normal or slightly above normal temperatures. Today will be warmer across the region with the warm front to the east of Montana. A back door cold front will move most of the way across NE Montana Wednesday morning before becoming stationary near Zortman and Jordan Wednesday afternoon. Little or no moisture is expected with this system. The front will be quasi-stationary in this area Thursday and Friday creating a NE to SW temperatures gradient with upper teens and 20s for highs in the NE and 40s for highs in the SW.

The ridge moves east on Saturday slowly lifting the front northeast. The next shortwave pushes through Saturday night and Sunday with ensembles making the case for slight pops to be included for this time. Despite flattening of the ridge, do not see marked shifts in temperatures at this time with slightly colder temperatures mainly in the north.

FORECAST CONFIDENCE & DEVIATIONS:

Confidence is high on moderating temperatures and mainly dry weather this week, with NBM leading the way this forecast cycle. Confidence is somewhat lower on temperatures along the stationary front Thursday and Friday.

AVIATION

Updated: Tuesday December 30, 2025 at 0900Z.

Expected Flight Category: VFR.

Synopsis: High to mid clouds will drift across NE Montana at times today and tonight with mostly clear skies in between. Winds: Light and variable early becoming west to NW 5 to 10 knots this morning and continuing through this afternoon. Winds tonight will be SW 5 to 10 knots in most areas and light and variable around KGGW.

GGW WATCHES/WARNINGS/ADVISORIES

None.

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