034
FXUS65 KGGW 310640 AAA
AFDGGW

Area Forecast Discussion...UPDATED
National Weather Service Glasgow MT
1240 AM MDT Mon Aug 31 2026

.KEY MESSAGES...

- An isolated high wind gust is possible Monday afternoon near the
  Canadian border east of Opheim.

- A Lake Wind Advisory is in effect for Fort Peck Lake from 6AM
  to 6PM Monday.

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

&&

.DISCUSSION...

WEATHER PATTERN OVERVIEW:

A closed upper low is departing the region as increasing west
winds wrap around the system into NE Montana for Monday. These
winds will ensure that the Lake Wind Advisory for Fort Peck Lake
remains well on track. Meanwhile, closer to the low, wind gusts
could exceed 40 to 50 mph along the Canadian border where pressure
gradient is tightest. An isolated high wind gust cannot be ruled
out east of Opheim to the North Dakota border. Given low
probability and coverage expected, no high wind highlights were
considered at this time but this merits watching.

Meanwhile, upper riding will move into the region for warm and dry
weather conditions on Tuesday as high temperatures soar well into
the 80s. For the middle of the week, the ridge axis will shift
downstream with upper level diffluent flow setting up over the
Northern High Plains. This will mean additional thunderstorm
chances by Wednesday evening.

FORECAST CONFIDENCE & DEVIATIONS:

NBM was left untouched for this forecast cycle as it captured
large scale patterns well. Much of the wind is expected to be
driven synoptically so opted not to add in high res data at this
time. To that end, there is low confidence that a remote shower
near the Canadian border east of Opheim could mix down a near high
wind Monday afternoon.

Otherwise, ensembles show excellent consensus on the ridge
developing on Tuesday before quickly translating downstream,
setting the stage for unsettled weather to return for the middle
of the week.


&&

.AVIATION...

LAST UPDATED: Monday August 31 at 0615Z.

FLIGHT CAT RANGE: VFR.

DISCUSSION: A closed upper low departing the region will begin to
be replaced by an upper ridge pattern. Look for gusty west winds
wrapping around the departing low before diminishing tonight.

WINDS: West at 15 to 25 kts, gusting to 35 kts. Winds look to
diminish after 2Z and become light and variable.


&&

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

&&

$$

weather.gov/glasgow