886
FXUS65 KGGW 292050
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
150 PM MST Sat Nov 29 2025

.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.

- Light precipitation chances and more seasonable temperatures
  return starting Tuesday.

&&

.DISCUSSION...

WEATHER PATTERN OVERVIEW:

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 lows in the 10s below and apparent
temperatures in the 20s below tonight for most areas north of the
Missouri River. There will be a brief recovery Sunday afternoon
with highs around zero, but similar wind chills again Sunday
night. Especially being the first event of the season with recent
mild weather, went with a Cold Weather Advisory through Monday
morning to cover this risk. Additionally, there is a slight chance
for low clouds or fog to develop late tonight that would limit
the drop off in temperatures, but introduce an additional hazard.

The next 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. Regardless,
temperatures will recover enough to alleviate cold concerns and
even rise above freezing for at least the southwest zones later in
the week.

FORECAST CONFIDENCE & DEVIATIONS:

Blended in high resolution guidance and NBM 90th percentile for
winds through Monday. Blended with the NBM 25th percentile for
temperatures through Monday in coordination with TFX to account
for ongoing deterministic warm bias that was populating with
around the 75th-90th percentile. Confidence is moderate to high on
the general temperature pattern for the next week, while low for
fog development tonight and type of upcoming precipitation.

-JEZ

&&

.AVIATION...

FLIGHT CATEGORY: Mainly MVFR/VFR

Extreme cold will be the main impact to TAF sites through the
cycle with temperatures below zero most of the time through Monday
morning. Winds will generally be light and variable. There is
moderate confidence for areas of MVFR ceilings to linger tonight into
Sunday morning, but overall clouds will be more few to scattered
aside from the slight chance that fog develops late tonight.

&&

.GGW WATCHES/WARNINGS/ADVISORIES...
Cold Weather Advisory from 6 PM this evening to 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