226
FXUS65 KGGW 302000
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
200 PM MDT Fri Oct 30 2026

.KEY MESSAGES...
- Patchy fog still lingers this afternoon and will continue
  through at least tomorrow morning.

- Light rain will begin tomorrow afternoon lasting into into
  trick or treating hours.

- Precipitation chances will increase on Monday as a frontal
  system moves across the region.


&&

.DISCUSSION...
Light rain will slowly move northeast into the region tomorrow
afternoon and linger overnight as it pushes east. Most locations
look to have a damp and chilly Halloween evening. Fog will
continue to impact portions of the region again tonight into
tomorrow morning. The most likely impacted areas will be along
river valleys. Fog could become locally dense, reducing visibility
in spots to 2 mile or less.

Meanwhile, as the upper ridge axis shifts northeast, a new
Pacific trough will gain influence late in the weekend into early
next week. Southwest flow aloft in advance of the trough with an
approaching shortwave will lead to breezy winds and increased
widespread precipitation chances late Sunday as surface low across
Wyoming tracks into the Dakotas. Models continue to trend higher
totals toward favoring southeast Montana, including Glendive and
Sidney. No snow is expected at the time of this forecast update.

FORECAST CONFIDENCE & DEVIATIONS:

No changes to NBM this cycle.

A lot of uncertainty regarding fog overnight. There`s very little
model agreement in location, timing, and intensity. I have the
most confidence in areas that saw fog last night/this morning
seeing fog again overnight. Further more, model agreement after
Wednesday is noticeably low.

&&

.AVIATION...
LAST UPDATED: 1900Z

FLIGHT CAT RANGE: FR to IFR during patchy fog.

DISCUSSION: Lingering MVFR/IFR stratus will break during brief
periods through the afternoon. Low stratus and patchy fog cannot
be ruled out again overnight.

WIND: East winds 10 to 15 kt decreasing overnight. Light and
variable thereafter.

&&

.GGW WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$

weather.gov/glasgow