Drummond, Montana Weather Forecast Discussion

491
FXUS65 KMSO 161349
AFDMSO
Area Forecast Discussion
National Weather Service Missoula MT
Issued by National Weather Service Spokane WA
749 AM MDT Tue Sep 16 2025
.DISCUSSION...
Key messages:
- Warmer and drier weather through the rest of the work week, with
  morning frost and fog possible
- Return of showers and thunderstorms possible late Friday into this
  weekend
Low clouds and light showers continue early this morning along
the Divide as an upper low slowly works southeastward into Wyoming.
Additionally, areas of clearing mainly from the US 93 corridor and
westward will allow for areas of morning valley fog.
Otherwise, high pressure ridging building over the Intermountain West
today through the end of the work week will bring a shift back to warmer
and drier weather. Cool mornings will give way to warm afternoons. Fog
and even some frost will be possible each morning, especially in
the higher elevation valleys near the Continental Divide.
Forecast models are beginning to show a flattening of the ridge
Friday afternoon into the weekend, though there are some disagreements
on the timing of this occurring. As the ridge flattens, westerly
winds and the potential for showers and thunderstorms will
increase, as daytime temperatures cool somewhat again.
&&
.AVIATION...
Low clouds, mountain obscurations and light showers continue
early this morning along the Divide as an upper low slowly works
southeastward into Wyoming. Areas of clearing mainly from the US
93 corridor and westward will allow for areas of morning valley
fog. Otherwise, high pressure ridging builds in this afternoon
lasting through much of the week with warm and dry conditions as
VFR conditions dominate. Winds will be relatively light overall
but an easterly gradient today and Wednesday will bring breezy
winds to ridgetops and west-east canyons that funnel east winds.
&&
.MSO WATCHES/WARNINGS/ADVISORIES...
MT...None.
ID...None.
&&
$$

NWS MSO Office Area Forecast Discussion