080
FXUS65 KGGW 051011
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
311 AM MST Fri Dec 5 2025

.DISCUSSION...

KEY MESSAGES:

- Temperature continues to swing with an unsettled weather
  pattern over the next week.

- A Winter Weather Advisory will be issued for tonight and
  Saturday for most of NE Montana.


WEATHER PATTERN OVERVIEW:

One area of light snow currently over NE Montana will move to the
east this morning. Will cancel existing Winter Weather Advisory
for Eastern Roosevelt, Richland, and Dawson Counties with forecast
issuance this morning.

A low pressure system will move across eastern Montana tonight and
Saturday which will bring an area of snow to most of NE Montana.
Most areas are looking at 2 to 4 inches with this system with
lesser amounts in the NE corner of the state and over Petroleum
County. The system will also bring a cold front south tonight.
Will issue a new Winter Weather Advisory for most of NE Montana
for tonight and Saturday for this system. Another wave of light
snow is expected to move through on Saturday night into Sunday as
another shortwave trough passes through the region. Temperatures
will continue to fluctuate next week as arctic air and warmer
intermountain air push back and forth with each other over the
area in response to the high pressure region over the Pacific
Northwest.

FORECAST CONFIDENCE & DEVIATIONS:

Increased PoP manually at times tonight and Saturday morning to
provide a more consistent forecast and better match neighboring
offices.

There is high confidence of accumulating snow occurring tonight
and Saturday with at least 2 inches in most areas. Lower
confidence in snow amounts NE of Opheim, Poplar and Culbertson. There
is moderate confidence in temperatures following closely to the
NBM during the entire forecast period. There is moderate
confidence in snowfall amounts from Friday night through Sunday.


&&

.AVIATION...

LAST UPDATED: 0900Z

FLIGHT CAT: a mix of VFR, MVFR, and IFR

DISCUSSION: A shortwave trough is beginning to bring
precipitation early this morning, mainly in the form of snow, to
the eastern TAF sites. There is moderate to high confidence of
light snow occurring through 12Z before ending by mid morning.
A mix of VFR, MVFR and IFR conditions is expected this morning
with a mix of VFR and MVFR this afternoon with varying amounts of
low clouds. The next wave of snow will begin reaching the area
around 03Z Saturday which will bring MVFR and IFR conditions back
into the area overnight.

WINDS: NW at 8 to 15 knots with gusts to 20 knots most of today.
Winds will become light and variable after 21z today and east 5 to
15 knots tonight in most areas and 15 to 20 knots at KGGW.


&&

.GGW WATCHES/WARNINGS/ADVISORIES...
Winter Weather Advisory from 8 PM this evening to noon MST
Saturday for Central and Southeast Phillips-Central and Southern
Valley-Daniels-Dawson-Garfield-McCone-Northern Phillips-Northern
Valley-Petroleum-Prairie-Richland-Southwest Phillips-Western
Roosevelt-Wibaux.

&&

$$

weather.gov/glasgow