296
FXUS65 KGGW 311936
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
136 PM MDT Mon Aug 31 2026

.KEY MESSAGES...

- A Lake Wind Advisory is in effect for Fort Peck Lake till 6PM.

- Temperatures look to increase for second half of the week with
  highs each day largely in the 80s.

- Showers and thunderstorms move through late Wednesday over the
  northern zones.



&&

.DISCUSSION...

WEATHER PATTERN OVERVIEW:

Closed upper low will move away from CWA tonight with SW upper
flow to replace it Tuesday. Monsoonal moisture will stay south of
the CWA Tuesday but higher clouds will increase.

The southwest flow will increase Wednesday with an upper trough
digging over the Pacific NW. Scattered showers will increase in
coverage as they move into the northern zones during the evening.

With the southwest flow this week, temperatures will warm into
the 80s most places with Friday looking to be the warmest day.
Temps reaching 90 is possible over the southeast zones.

Later this week, the upper trough becomes an upper low and could
bring another round of showers into the area late in the weekend
or early next week.

FORECAST CONFIDENCE & DEVIATIONS:

NBM was mainly followed through this period. TFJ

&&

.AVIATION...

LAST UPDATED: 1900Z.

FLIGHT CAT RANGE: VFR.

DISCUSSION: Winds will relax quickly relax this evening with clear
skies tonight. Southeast winds will increase late Tuesday with
increasing high and middle clouds. TFJ

&&

.GGW WATCHES/WARNINGS/ADVISORIES...
Lake Wind Advisory until 6 PM MDT this evening for Central and
Southeast Phillips-Central and Southern Valley-Garfield-McCone-
Petroleum.

&&

$$

weather.gov/glasgow