830
FXUS65 KGGW 191011
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
311 AM MST Sun Jan 19 2025

.DISCUSSION...

KEY MESSAGES:

- Cold Weather Advisories remain in effect across the northeast
  Montana through noon Monday. A Warning is now in effect for
  Daniels and Sheridan counties, which could be expanded for
  tonight.

- The coldest temperatures and wind chills are expected tonight
  into Monday morning.

- Increasing NW winds Tuesday Night and Wednesday could bring
  blowing snow concerns.

- Temperatures will warm to near normal or slightly above normal
  starting on Tuesday and remain that way for the remainder of the
  week.

WEATHER PATTERN OVERVIEW:

Arctic high pressure will linger over the northern plains through
Monday before sliding to the southeast. Upper ridge begins to push
across the Rockies with a chinook developing in Alberta. A
shortwave diving south through the Canadian prairies will push the
chinook warming southward, driving out the arctic airmass with
increasing west winds on Tuesday.

A little light snow is possible as this wave pulls a weak cold
front through eastern Montana on Wednesday. Accumulations will be
minimal. The front will slow the warming slightly but overall
temperatures into the weekend will remain warm.

FORECAST CONFIDENCE & DEVIATIONS:

No significant deviations from the NBM.

Did include some of the HRRR to the pops for tonight to add some
lake effect snow off the main area above Fort Peck Dam through
McCone and Prairie counties. A big enough temperature difference
over the lake expected to overcome the stronger northwest winds to
extend the plume well southward.

&&

.AVIATION...
VFR. Bitter cold temperatures will impact flights between now and
Tuesday morning. Temperatures will be well below zero at times.
Otherwise, skies are expected to be mainly clear through Sunday.


&&

.GGW WATCHES/WARNINGS/ADVISORIES...
Cold Weather Advisory from 6 PM this evening to noon MST Monday
for Central and Southeast Phillips-Garfield-Petroleum-Southwest
Phillips.

Cold Weather Advisory until noon MST Monday for Central and
Southern Valley-Dawson-Eastern Roosevelt-McCone-Northern
Phillips-Northern Valley-Prairie-Richland-Western Roosevelt-
Wibaux.

Extreme Cold Warning until noon MST Monday for Daniels-Sheridan.

&&

$$

weather.gov/glasgow