396
FXUS65 KGGW 200859
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
159 AM MST Thu Nov 20 2025

.DISCUSSION...

KEY MESSAGES:
- A small chance (20-50%) exists for fog along the Milk and
  Missouri River Valleys through mid-morning.

- Mild temperatures continue through Monday.

- Colder air moves in Monday night that is expected to linger
  through Thanksgiving.


WEATHER PATTERN OVERVIEW:
Low cloud cover with a clearing line looks to be set along the
MT/ND border. These clouds should clear around or before mid0-
morning. There is a low (20-50%) probability of fog developing
again tonight along the Milk and Missouri River Valleys before
dissipating around 8-10AM after sunup. After that, the upper
level pattern over the western states will generally keep Montana
under a ridge into the weekend. This maintains above normal
temperatures and dry weather through the weekend. Models and
ensembles are increasingly pointing toward a pattern change early
next week with much colder temperatures. There are wide variations
in precipitation potential in the models and ensembles at this
time for next week.


FORECAST CONFIDENCE & DEVIATIONS:
No deviations from NBM were observed.

There is HIGH confidence of temperatures dropping to near and
below normal by Tuesday.

There is MODERATE confidence of precipitation occurring next
week, with low confidence on accumulations.

There is LOW confidence of fog redeveloping this morning.

GAH


&&

.AVIATION...
LAST UPDATE: 0800Z

FLIGHT CAT RANGE: MVFR - VFR.

DISCUSSION: A clearing line of MVFR clouds currently rides the
MT/ND border. Most clouds look like they will clear out of KSDY
before 10Z this morning. There is a small chance (20-50%) that
river valley fog could develop and snake up the Missouri and Milk
River Valleys and affect KOLF and maybe KGGW. Rough timing for fog looks
to be around 10-15Z. A FEW mid level clouds may be possible
through the rest of the cycle.

WIND: Light and variable or South through the cycle.

EQUIPMENT: KOLF`s ASOS telecomm circuit is down and can not be
dialed into. Therefore, AMD NOT SKED for this TAF until repairs
can be made.

GAH


&&

.GGW WATCHES/WARNINGS/ADVISORIES...
None.


&&

$$

weather.gov/glasgow