401
FXUS65 KGGW 272015
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
Issued by National Weather Service Billings MT
215 PM MDT Tue May 27 2025

.DISCUSSION...

KEY MESSAGES:

- Isolated rain showers, and a rumble of thunder or two, are
  possible this evening and again on Friday.

- Generally dry conditions and slowly warming temperatures will
  continue through the end of the week.

- More widespread rain and cooler temperatures possible next week.

WEATHER PATTERN OVERVIEW:

Upper low over the upper midwest will slowly drift east as an
upper ridge builds into the northern Rockies. This will lead to a
general warming trend across eastern Montana this week. A weak
shortwave pushing through the ridge is developing a few showers
across central Montana this afternoon. These showers will move
east, mainly across southern Montana through the evening hours.
With this, a weak thunderstorm or two is possible. Another
shortwave will slide through the ridge on Friday, with another
round of showers possible, this time across the north. Cold front
with the wave will bring stronger northwest winds, which may be
enough for a Lake Wind Advisory. Beyond this weekend, an upper
trough moving into the Pacific Northwest will displace the ridge,
and lead to cooler and wetter weather for the first week of June.

FORECAST CONFIDENCE & DEVIATIONS:

Increased coverage area of showers and weak thunderstorms this
afternoon into tonight based on recent high-resolution model runs.
Otherwise, went with the NBM through the rest of the 7 day
period.

&&

.AVIATION...

VFR conditions will prevail. Isolated showers and weak
thunderstorms are possible this afternoon into tonight, but
confidence is low on any impacts to TAF sites. Otherwise, mid and
high clouds will move across the region overnight with clearing
expected in the morning.

&&

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

&&

$$

weather.gov/glasgow