434
FXUS65 KGGW 182049
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
149 PM MST Tue Nov 18 2025

.DISCUSSION...

KEY MESSAGES:

- Mild temperatures are expected through the week.

- Light precipitation chances at times tonight south of the
  Yellowstone River.

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

WEATHER PATTERN OVERVIEW:
Complex upper pattern over the western states will generally keep
Montana under mostly a ridge into the weekend. This will keep
above normal temps around through the weekend.

A disturbance looks to kick up rainshowers tonight that till move
northeast, brushing our southeast zones. Patchy fog is expected
tonight over the eastern zones but widespread dense fog is not
expected.

Then mainly dry weather and above normal temperatures can be
expected through the weekend.

Models and ensembles are pointing towards a pattern change early
next week with colder temperatures. There is good agreement on
colder temperatures at this point with some variations on
how cold it will be. There are wide variations in precipitation
potential in the models and ensembles at this time for next week.

FORECAST CONFIDENCE & DEVIATIONS:
Mainly went with NBM on all elements.

Models did not handle the low clouds that moved southeast into
the central zones today so that may have to be watched by later
shifts tonight. These low clouds will likely contribute to fog
formation. Details were sketchy at this time. TFJ

&&

.AVIATION...
Update time: 2045Z/145 pm

Flight Category: Mostly VFR, areas of IFR tonight.

Synopsis: Low clouds have spread southeast, extending from Havre
to Glasgow as of 2045z. They may lower tonight, producing patchy
fog tonight as they move toward KSDY and KGDV. MVFR ceilings can
be expected to linger into Wednesday with VFR at KGDV. Clearing
of the clouds are expected from NW to SE Wednesday night.

Winds: Less than 10 kts through tonight then increase from the NW
Wednesday, speeds 10-20 with gusts to 25-30 kts. TFJ

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.

&&

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

$$

weather.gov/glasgow