494
FXUS65 KGGW 152109
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
209 PM MST Mon Dec 15 2025

.DISCUSSION...

KEY MESSAGES:

- High Wind Warnings and Watches have been issued. Warning for
  Phillips county through 11 am Tuesday, Watch for the entire area
  Wednesday and Wednesday night.

- Seasonably warm temperatures and mostly drier weather expected
  through Wednesday.

- Chances for wintry precipitation beginning Wednesday night that
  could fierce blowing snow across northern Valley, Daniels and
  Sheridan counties.

WEATHER PATTERN OVERVIEW:

Busy times ahead as arctic airmass over Canada is being held at
bay with the zonal flow keeping the mild Pacific airmass over
Montana. But a cold front will drop in Tuesday and help mix in
higher level winds to the surface over the CWA tonight and Tuesday
morning. Wind gusts to 60 mph can be expected over Phillips
county, where a High Wind Warning remains in effect.

A stronger front then drops in late Wednesday with 850 mb winds
cranking to 60 kts over the area. It also has a better pressure
gradient and lapse rates. Therefore a High Wind Watch was issued
for the entire CWA. About an inch or two of snow could fall from
northern Valley county through Sheridan county that could cause
blowing snow and visibility less than a mile.

Another disturbance will move east through the area Friday,
bringing a slight bump in temperatures and a chance of a rain/snow
mix.

The roller coaster ride in temperatures look to continue into the
weekend.

FORECAST CONFIDENCE & DEVIATIONS:

Blended NBM and NBM90 for the winds tonight into Tuesday morning
and again for Wednesday and Wednesday night. Also blended NBM
temperatures tonight with NBM75.

Confidence high Tuesday, moderate through Friday then low starting
this weekend as it will be highly dependent on where the arctic
front lies. TFJ

&&

.AVIATION...
UPDATED: 2100z/200 pm

FLIGHT CATEGORY: VFR.

DISCUSSION: West winds will increase this evening then shift to
NW Tuesday morning with the passage of a cold front. Gusts to 40
kts can be expected. Drifting snow is possible but widespread
blowing snow is not.

LLWS: occasionally tonight and Tuesday morning. TFJ

&&

.GGW WATCHES/WARNINGS/ADVISORIES...
High Wind Warning until 11 AM MST Tuesday for Central and
Southeast Phillips-Northern Phillips-Southwest Phillips.

High Wind Watch from Wednesday morning through late Wednesday
night for Central and Southeast Phillips-Central and Southern
Valley-Daniels-Dawson-Eastern Roosevelt-Garfield-McCone-Northern
Phillips-Northern Valley-Petroleum-Prairie-Richland-Sheridan-
Western Roosevelt-Wibaux.

High Wind Watch from Wednesday morning through Wednesday evening
for Southwest Phillips.

&&

$$

weather.gov/glasgow