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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 this week. Look for mostly dry weather conditions as well as milder temperatures taking hold. That said, expect far colder readings in the valleys and up near the Canadian border with the Little Rockies south to Jordan, Winnett, and east to Terry to see the warmest temperature readings. By the weekend, however, most of NE Montana will see readings near or above freezing. South of Highway 2 will enjoy high temperatures in the 40s to near 50 degrees.

As the ridge slides east, the next shortwave pushes through Saturday night 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, just a gradual downtick.

FORECAST CONFIDENCE & DEVIATIONS:

Confidence is high on moderating temperatures and mainly dry weather this week, with NBM leading the way this forecast cycle.

AVIATION

Updated: Monday December 29, 2025 at 2130Z.

Expected Flight Category: VFR.

Synopsis: High to mid clouds are expected time to time into tonight. Winds: Winds will be light and variable at times, trending west at 5 to 8 kts.

GGW WATCHES/WARNINGS/ADVISORIES

None.