textproduct: Pocatello

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.