103
FXUS65 KPIH 312024
AFDPIH

Area Forecast Discussion
National Weather Service Pocatello ID
124 PM MST Sat Jan 31 2026

.KEY MESSAGES...

- Temperatures will steadily climb through the weekend, with
  many afternoon highs reaching the 40s and lower 50s by Sunday.

- After a brief relative cooldown Monday and Tuesday, the dry
  and warming trend returns through the end of the week.

- Stagnant air mass will remain in place through the weekend.

&&

.SHORT TERM /THROUGH SUNDAY NIGHT/...
Issued at 124 PM MST Sat Jan 31 2026

Minimal impacts are forecast for East Idaho. Satellite imagery
shows upper ridge over the western states, with deep trough off
the Pacific coast. High clouds in place over the region, but
still plenty of sunshine to continue to help warm temperatures
under building ridge. Shortwave feature is expected to push into
the PacNW Sunday, shifting across East Idaho through Sunday
night. This flattens the ridge over the region and allows for
increased cloud cover, but there is not enough moisture
associated with the feature to produce anything more than a
flurry or two over higher elevations to the north Sunday night.
Temperatures for Sunday are still expected to warm some 2-5
degrees over today`s highs.

&&

.LONG TERM /MONDAY THROUGH FRIDAY/...
Issued at 124 PM MST Sat Jan 31 2026

Monday looks to be slightly cooler behind Sunday night
shortwave feature. Second shortwave reinforces the northwest
flow for Tuesday, but this feature also looks to remain dry.
Both days should be the coolest of the week as the ridge
rebounds by midweek. Dry conditions are forecast for the
remainder of the week, with trend toward warmer temperatures and
return to overnight surface based inversions as the ridge axis
slowly shifts overhead through the end of the week.


&&

.AVIATION /18Z TAFS THROUGH 18Z SUNDAY/...
Issued at 1025 AM MST Sat Jan 31 2026

VFR conditions are expected to persist under the ridge of high
pressure over Eastern Idaho. Winds are expected to remain light
today and tonight with FEW to SCT mid and upper level clouds.

&&

.AIR QUALITY...
Issued at 117 PM MST Fri Jan 30 2026

Ridge of high pressure rebuilds for the weekend, strengthening
surface based inversions and increasing the potential for
pollutant trapping. A pair of weak shortwaves may be enough to
temporarily break down inversions Monday and Tuesday, but the
ridge redevelops for the latter half of the week, and stagnant
conditions are likely to return.

&&

.PIH WATCHES/WARNINGS/ADVISORIES...
Air Stagnation Advisory until noon MST Monday for IDZ054-059.

&&

$$

SHORT TERM...DMH
LONG TERM...DMH
AVIATION...AMM
AIR QUALITY...DMH