Whitewater, Montana Weather Forecast Discussion

695
FXUS65 KGGW 212029
AFDGGW
Area Forecast Discussion
National Weather Service Glasgow MT
229 PM MDT Sun Sep 21 2025
.DISCUSSION...
KEY MESSAGES:
1) A cold front will move into northeast Montana tonight bringing
gusty winds and chances for rain.
2) Smoke from wildfires in Canada may affect air quality this
evening ahead of the cold front.
3) A Lake Wind Advisory has been issued for gusty winds from
midnight tonight through 6pm Monday.
WEATHER PATTERN OVERVIEW:
Above average temperatures today will soon be replaced with below
average temperatures will the passage of a cold front. Gusty
winds have prompted a Lake Wind Advisory for tonight. Cooler
weather with chances for rain and thunderstorms will mainly stay
in central and southern Montana. The highest chances for rain
remains west of HWY 24. While rain totals have lowered since
yesterday afternoon, higher totals remain in southern and central
Montana. Localized convection may still produce thunderstorms
dropping greater than 0.10" of rain. Looking forward through the
week, warm and dry conditions will return with the building of an
upper level ridge over the region.
FORECAST CONFIDENCE & DEVIATIONS:
Winds were increased Day 1 and Day 2 with a blend of the current
forecast and NBM90. Confidence is lowering in the reduction in
visibilities and air quality from wildfire smoke. Areas of smoke
remains in the forecast, however, the timing in which we see its
effects is less certain.
&&
.AVIATION...
UPDATE: 1930Z, September 21
FLIGHT CAT RANGE: VFR
DISCUSSION: Clear skies and light winds will continue through
this evening. Tonight a cold front will bring gusty winds and
chances for rain in central and southern Montana. Highest chances
for rain remain west of KGGW. There is low confidence in reduced
visibilities due to smoke ahead of the cold front.
WIND: West winds 5 to 10 kts will remain steady though the
afternoon before becoming light and variable briefly at 0Z. By 5Z northwest
winds will increase to 10 to 20 kts. Winds are expected to
diminish Monday night.
EQUIPMENT: KSDY AMD NOT SKED will remain in place
until METARs comms issue is repaired.
&&
.GGW WATCHES/WARNINGS/ADVISORIES...
Lake Wind Advisory from midnight tonight to 6 PM MDT Monday for
Central and Southeast Phillips-Central and Southern Valley-
Garfield-McCone-Petroleum.
&&
$$
weather.gov/glasgow

NWS GGW Office Area Forecast Discussion