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DISCUSSION

KEY MESSAGES:

1) Milder temperatures will continue over the next couple of days though with a sharp gradient.

2) Mostly dry weather is expected with the influence of a large scale upper ridge pattern through the balance of the week.

WEATHER PATTERN OVERVIEW:

A large high amplitude ridge will continue over the wester U.S. and influence NE Montana with mild and dry weather conditions. There will be a sharp gradient with much of the northeast half of the CWA seeing lows each day in the single digits and teens and highs in the 20s and 30s. Meanwhile, lows over the Little Rockies and south of Fort Peck Lake will be in the 20s and low 30s with highs in the mid 30s and 40s each day.

The ridge looks to flatten and slide east with enough ensemble guidance to leave in slight chance pops for Saturday night, especially near the Canadian border. That said, do not see marked shifts in temperatures at this time. FORECAST CONFIDENCE & DEVIATIONS:

Confidence remains above average on mild temperatures and mainly dry weather this week, with NBM helping this forecast cycle take shape. Confidence is somewhat lower on temperatures along the stationary front Thursday and Friday and for precipitation chances on Saturday night.

AVIATION

Updated: Tuesday December 30, 2025 at 2030Z.

Expected Flight Category: VFR.

Synopsis: High to mid level clouds will continue at times into tonight. Look for west to northwest winds generally 5 to 10 kts, at times light and variable.

GGW WATCHES/WARNINGS/ADVISORIES

None.