969
FXUS65 KMSO 060905
AFDMSO

Area Forecast Discussion
National Weather Service Missoula MT
305 AM MDT Mon Oct 6 2025

.DISCUSSION...

KEY MESSAGES:

- Widespread frost/freeze this morning and again on Tuesday
  morning

- Dry with seasonable temperatures through midweek


Flow aloft will become northwesterly this afternoon on the heels
of a departing trough. A ridge of high pressure will build over
the Northern Rockies early this week. Before the ridge becomes
established, cold air leftover from the departing trough and clear
skies will result in cold overnight low temperatures this morning
and again on Tuesday morning. Expect low temperatures to be about
5 to 10 degrees below normal. The valleys of western Montana and
the higher valleys of north-central Idaho will see lows into the
20s. Typically colder locales such as Seeley Lake, Polebridge,
Philipsburg, and the upper Clark Fork and Blackfoot River valleys
could easily see teens for lows. The lower valleys of Idaho and
Clearwater counties will not be quite as cold, but do still expect
frost in the mornings. Daytime high temperatures will rebound
nicely, gradually increasing throughout the week to about 10
degrees above normal by the end of the week.

Speaking of the end of the week, most ensemble model members are
indicating unsettled weather arriving later in the week through
the weekend, though timing and intensity are still rather
uncertain.


&&

.AVIATION... Dew point depressions of only a few degrees early
this morning, along with calm winds, are pointing to fog formation
this morning at all Northern Rockies terminals. Decreased
visibility lasting until about 06/1500Z will be possible.
Otherwise, expect light winds and mostly clear skies this
afternoon and tonight as high pressure builds through midweek.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...Freeze Warning until 10 AM MDT this morning for Flathead/Mission
     Valleys...Missoula/Bitterroot Valleys.

ID...Frost Advisory until 9 AM PDT this morning for
     Orofino/Grangeville Region.

&&

$$