Sidney, Montana 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

907
FXUS65 KGGW 212102
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
202 PM MST Fri Feb 21 2025

.DISCUSSION...

KEY MESSAGES:

- Arctic air is slowly pushing out of northeast Montana. Above
  average temperatures will move in areawide by Sunday.

- Isolated light rainfall is expected on Sunday night into Monday
  evening. Rain that does fall will likely freeze on frozen
  ground leaving icy roads and sidewalks.

- Thawing conditions will lead to difficult access on unpaved
  roads, and potentially bring muddy conditions through the middle
  of next week.

WEATHER PATTERN OVERVIEW:
A stationary front over central Montana will slowly begin to move
into northeast Montana. With the warm temperatures in central
Montana being pushed over top of the valley arctic air and surface
snowpack, there is low to moderate (20 to 40) confidence of fog
developing along the Milk River and Missouri River basins tonight.
Temperatures in valleys are much colder than along ridges due to
the stationary boundary. West winds on Saturday and Sunday will
eventually allow the entire area to mix out the arctic air, so
temperatures will jump above average by Sunday. The Little Rockies
will become rather windy by Saturday evening, so a High Wind Watch
is out for gusts to near 60 mph from 5 AM Saturday through 11 PM
Saturday for southwest Phillips county.

There is low to moderate (20 to 40) percent of scattered rainfall
and freezing rain for Sunday night through Tuesday morning. Some
locations may even see accumulation greater than 0.01", which
would create icy conditions on Monday morning and Tuesday morning.

FORECAST CONFIDENCE & DEVIATIONS:

Deviations include 50/50 of NBM/NBM10 for tonights low temperature.
50/50 NBM/NBM25 for Saturday and Saturday night highs and lows.
Addition of Fog along the Milk and Missouri Valleys Saturday
morning. And 33/66 NBM/NBM90 for wind from 12Z Sunday through 06Z
Monday.

There is low to moderate confidence for both rainfall, freezing
rain, and fog in the above mentioned discussion. There is high
confidence of temperatures climbing above average starting on
Sunday. Went with NBM for now but we may have to utilize something
closer to NBM90 as the possible rain and freezing rain event on
Sunday night draws closer.

&&

.AVIATION...

LAST UPDATED: 2100Z

FLIGHT CAT RANGE: VFR - IFR

DISCUSSION: Mostly clear skies are expected early tonight, but
there is low to moderate (20 to 40 percent) confidence of IFR
conditions occurring due to fog development for KGGW and KOLF from
07Z through 17Z Saturday. There is high (80 percent) confidence
VFR conditions will take hold after 17Z Saturday.

WIND: For KGGW and KOLF, west at 5 to 10 kts increasing to 10 to
15 kts after 18Z Saturday. For KSDY and KGDV, southwest at 6 to
12 kts becoming west southwest at 10 to 17 knots after 18Z
Saturday.

LLWS: Low level wind shear is expected to impact the terminals
from 09Z to 18Z.



&&

.GGW WATCHES/WARNINGS/ADVISORIES...
High Wind Watch from late Saturday night through Sunday evening
for Southwest Phillips.

&&

$$

weather.gov/glasgow