Sidney, Montana 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

257
FXUS65 KGGW 200930
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
230 AM MST Sat Dec 20 2025

.DISCUSSION...

KEY MESSAGES:

- Cold temperatures will prevail this morning especially in the
  north. Will continue the Cold Weather Advisory along the
  Canadian Border this morning.

- Temperatures will gradually warm into Monday with a slight
  chance of wintry mix Monday.

- A slightly warmer than normal temperatures and limited chances
  for precipitation is expected for most of next week.

WEATHER PATTERN OVERVIEW:

The arctic front that moved south across the forecast area
yesterday will return north as a warm front today and tonight.
With the front expected to be near Zortman, Jordan, and Glendive
this afternoon, look for a wide range in highs today with
Plentywood in the NE corner of the state being in the single
digits while Winnett reaches the lower 40s. Will keep Northern
Valley, Daniels and Sheridan Counties in the Cold Weather
Advisory until 9 am for wind chills near -25.

The front will move north of the forecast area tonight although
cold temperatures will linger in the north until Sunday morning
with low level inversions.

Warmer temperatures are expected for Sunday and Monday. A
shortwave trough on Monday will bring chances for mixed
precipitation. For the remainder of next week, there will be
slight chances for mixed precipitation Wednesday night and Friday.
Otherwise, look for dry weather with temperatures between near
normal and 10 degrees above normal.

FORECAST CONFIDENCE & DEVIATIONS:

No changes to the NBM today. Confidence is high with the
temperature pattern in general the next few day but lower today in
the area where the frontal boundary will be this afternoon.
Confidence is low on any precipitation chances for the next week.


&&

.AVIATION...

UPDATED: 0930Z

FLIGHT CATEGORY: VFR.

DISCUSSION: Arctic front will stay south of the TAF sites today
and move north through the area tonight. There will be some mid
and high clouds at times with otherwise clear skies today and
tonight.

WINDS: NW winds between 5 and 20 knots early this morning will
become light and variable after 12z. Winds will remain variable at
less than 10 knots today and become SW to SE tonight at 5 to 10
knots.


&&

.GGW WATCHES/WARNINGS/ADVISORIES...
Cold Weather Advisory until 9 AM MST this morning for Daniels-
Northern Valley-Sheridan.

&&

$$

weather.gov/glasgow