397
FXUS65 KGGW 071951
AFDGGW

Area Forecast Discussion
National Weather Service Glasgow MT
151 PM MDT Mon Sep 7 2026

.KEY MESSAGES...
- Strong west winds are expected tonight and Tuesday. Gusts 40 to
  50 mph are possible.

- Warm day ahead a cold front Thursday, then cooler with the
  chance of showers through the weekend.

&&

.DISCUSSION...
WEATHER PATTERN OVERVIEW:
A strong upper low over western Montana is expected to be over
southern Sask tonight. Showers with heavy rain and scattered
thunderstorms moved N-NE through the CWA this morning. An intense
line of showers/storms were moving east between Billings and
Jordan producing wind gusts to 63 mph (Winnett). This line is
expected to move east for a few more hours but will quickly fall
apart when the diurnal heating begins to wane.

Wrap-around rain will move east into north-central Montana this
evening that will move into the CWA Tuesday as an upper
disturbance aids in the instability.

Things quiet down a bit for Wednesday with sunshine and
temperatures rebound to near normal, mid 70s to near 80 for the
CWA.

On Thursday, the next disturbance moves east from western Canada
with a cold front approaching the CWA. Temps should reach near 80
across the northern zones and possibly near 90 in the southeast
zones. With Min RH in the teens and an increasing West wind, fire
weather highlights may need to be considered.

Ensembles then show a much cooler period expected starting Friday
with shower chances increasing. Look for high temps to drop into
the 60s, possibly 50s if steadier rainshowers occur over the
weekend.

FORECAST CONFIDENCE & DEVIATIONS:
Pops were tweaked toward current conditions and CAMs for the
remainder of the afternoon. Winds tonight and Tuesday were
generally left untouched as NBM90 wasn`t too far off from NBM.

High confidence on rain this morning with diminishing confidence
for rain this afternoon. High confidence for strong west winds
this afternoon, tonight and Tuesday. Tweaked pops early this
morning. No other changes at this time. TFJ


&&

.AVIATION...

LAST UPDATED: 1950Z

FLIGHT CAT RANGE: VFR then MVFR Tuesday AM KGGW & KOLF

DISCUSSION: West winds will continue increasing this afternoon
with gusts approaching 40 kts in many places by tonight. Gusts
over 40 knots cannot be ruled out though!

Windy conditions continue Tuesday with gusts 35-45 kts through
about 21z then should diminish.

MVFR cloud levels can be expected to move back in from the NW
Tuesday.

TFJ


&&

.GGW WATCHES/WARNINGS/ADVISORIES...
Lake Wind Advisory until midnight MDT Tuesday night for Central
and Southeast Phillips-Central and Southern Valley-Garfield-
McCone-Petroleum.

&&

$$

weather.gov/glasgow