Sidney, Montana 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

637
FXUS65 KGGW 221040
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
340 AM MST Sat Feb 22 2025

.DISCUSSION...

KEY MESSAGES:

- Arctic air is slowly pushing out of northeast Montana. Above
  average temperatures will move in area wide 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:
Westerly flow across the northern Rockies, generating a chinook
with strong downslope winds will spread warm air eastward and
erode the remnants of the arctic airmass. Weak waves in the flow
will pull strong winds downward. The strongest winds are expected
Sunday with the flattening of flow.

On Monday a weak Alberta low clips the state with a low chance of
rainfall from Sunday night into Monday morning. With the overnight
timing icy conditions are possible even with limited accumulation.

Toward the end of the week a ridge builds over the west keeping
temperatures very warm.

FORECAST CONFIDENCE & DEVIATIONS:

Probability for winds over 50 mph runs around 80% to 90% for the
Little Rockies late Saturday night into Sunday morning, continuing
to justify the High Wind Watch.

&&

.AVIATION...
VFR with mostly high cloud across the region. With a shallow
overnight inversion, low level wind shear is expected to impact
the terminals though 18Z.



&&

.HYDROLOGY...
As arctic air pushes east into the central plains, a ridge will
move in to bring temperatures above average through the end of
next week. Although temperatures each night will drop near or
below freezing, warm daytime temperatures will increase snowmelt
and lead to ponding in low lying areas. There is moderate
confidence precipitation amounts are expected to remain below one
tenth of an inch Sunday night into Monday night, so little to no
impact on runoff is expected from this event.

&&

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

&&

$$

weather.gov/glasgow