597
FXUS65 KGGW 200830
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
230 AM MDT Fri Sep 20 2024

.DISCUSSION...
KEY MESSAGES:

 - Breezy conditions expected today, with a Lake Wind Advisory in
   effect for the afternoon and overnight hours.

- An upper ridge builds in next week with a return to above normal
  temperatures.

WEATHER PATTERN OVERVIEW:

A shortwave trough will slide along the Canadian border today, and
drop a cold front south across the region this afternoon. Winds
will increase with the cold air advection and a few showers are
possible with the increasing instability. Winds will be strong
enough for a Lake Wind Advisory and should persist through most of
the night.

Northwest flow aloft and a Canadian high over the region will
bring cooler temperatures for the weekend. One more shortwave
slides through the region on Monday with showers generally across
central Montana. Behind this wave, the upper ridge rebounds with
temperatures returning to above normal levels.

FORECAST CONFIDENCE & DEVIATIONS:

Once again blended NBM90 into the winds and also increased the
NBM PoPs slightly for today. No other deviations from NBM were
made with this forecast package.


&&

.AVIATION...
VFR. Clear skies and light winds will continue into the morning.
An approaching cold front will kick up west to northwest winds
this afternoon that will persist overnight. Some mid-level clouds
will accompany the front along with scattered showers.

&&

.GGW WATCHES/WARNINGS/ADVISORIES...
Lake Wind Advisory from 1 PM this afternoon to 4 AM MDT Saturday
for Central and Southeast Phillips-Central and Southern Valley-
Garfield-McCone-Petroleum.

&&

$$

weather.gov/glasgow