509
FXUS65 KGGW 301044
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
344 AM MST Sun Nov 30 2025

.DISCUSSION...

KEY MESSAGES:

- Arctic air settles in with a Cold Advisory across the Hi-Line
  through Monday morning for wind chills as low as 30 below zero.

- Patchy to locally dense freezing fog along parts of the Hi-line.

- More seasonable temperatures return starting Tuesday.

&&

WEATHER PATTERN OVERVIEW:

Today & Monday: The coldest temperatures of the season so far
will be over the area through Monday morning under Arctic high
pressure. The current forecast has widespread highs in the 10s and
apparent temperatures in the 20s to 30s below for most areas
north of the Missouri River. There will be a brief recovery in the
afternoon with highs around zero, but similar wind chills again
tonight. Patchy dense fog this morning is expected to diminish
through the morning. Steam off Fort Peck Lake will begin to blow
north into Glasgow this afternoon.

Tuesday and beyond: The next chance (20 - 50% chance) for
measurable precipitation is Tuesday as a low drops south and east
through Idaho into Wyoming. Another upper level trough crossing
the Northern Rockies by Friday has the potential to drop some
widespread mixed precipitation, though too early to get much model
agreement on type and amount. An unsettled pattern will cause
temperatures to swing and precipitation chances to linger through
next weekend.

FORECAST CONFIDENCE & DEVIATIONS:
Blended NBM90 and a blend of HiRes models for winds day 1-2.
Lowered day 1 - 2 temperatures using NBM10/NAM DNGBC and NBM25
respectively. Lowered visibilities with the HREF for this morning
to bring in freezing fog.

&&

.AVIATION...
Extreme cold will be the main impact to TAF sites through the
cycle with temperatures below zero through Monday morning. Winds
will be light and variable. MVFR to IFR ceilings and visibilities
will linger this morning with freezing fog.



&&

.GGW WATCHES/WARNINGS/ADVISORIES...
Cold Weather Advisory until 10 AM MST Monday for Central and
Southeast Phillips-Central and Southern Valley-Daniels-Eastern
Roosevelt-Northern Phillips-Northern Valley-Sheridan-Western
Roosevelt.

&&

$$

weather.gov/glasgow