Glentana, Montana Weather Forecast Discussion

231
FXUS65 KGGW 190843
AFDGGW
Area Forecast Discussion
National Weather Service Glasgow MT
243 AM MDT Fri Sep 19 2025
.DISCUSSION...
KEY MESSAGES:
- There is potential for fog, dense at times to form in the
  eastern portion of the area.
- Dry and warming conditions are expected today through Sunday.
- A cold front will swing through Sunday to Monday to bring breezy
  conditions and possible light rain.
WEATHER PATTERN OVERVIEW:
A weak trough pattern will become a ridge into the day Sunday.
Prior to this, there is moderate confidence of patchy dense fog
forming along the low elevation locations east of Glasgow and
along the Yellowstone River Valley. There is high confidence the
fog will burn off by noon.
A warming trend with a cold front on Sunday night will allow
temperatures to drop and bring low confidence of accumulating
rainfall on Monday. There is very little indication of
precipitation until late in the forecast, but confidence on this
is currently low.
FORECAST CONFIDENCE & DEVIATIONS:
Used a mix of NBM and NBM 90 for winds on Day 1. Adjusted PoPs for
cold front on Sunday night into Monday. Confidence is described in
the discussion above.
&&
.AVIATION...
UPDATE: 0900Z, September 19th
FLIGHT CAT RANGE: MVFR to LIFR until 17Z, then VFR.
DISCUSSION: A slow moving low pressure and east surface winds are
allowing low visibilities to begin. There is moderate (50 percent)
confidence of fog, dense at times, occurring through late morning
at KOLF, KSDY, and KGDV. Visibility and cloud ceilings have low
potential to reach airport shutdown briefly. Then the fog is
expected to lift by late morning to reach VFR conditions after
18Z.
WIND: From the SE and E around 5 to 15 kts today.
EQUIPMENT: Comms issues with the KSDY observation remain. AMD NOT
SKED will remain in place until METARs are available.
&&
.GGW WATCHES/WARNINGS/ADVISORIES...
Dense Fog Advisory until 11 AM MDT this morning for Daniels-
Dawson-Eastern Roosevelt-Richland-Sheridan-Western Roosevelt.
&&
$$
weather.gov/glasgow

NWS GGW Office Area Forecast Discussion