textproduct: Pocatello

KEY MESSAGES

- Frost possible across portions of Snake Plain tonight, mainly outside the interstate corridor.

- Next chance of rain late week.

DISCUSSION

Issued at 114 PM MDT Mon Sep 14 2026

Cool temperatures remain in place today behind frontal system that passed through this weekend. Winds remain breezy as well, but overall impact will be greatest overnight as lows fall to coldest of the week. NBM retains a wide swath of sub-36 degree lows across the Snake River Plain, but traditional NAM and GFS guidance puts temperatures slightly cooler than NBM, closer to potential freeze. Will maintain the Frost Advisory across much of the Snake River Plain, and note that the interstate corridor through the Snake Plain will likely be a few degrees warmer than thresholds of concern, but that shifts cooler moving north of Idaho Falls.

Temperatures shift warmer through the week as ridge rebuilds ahead of next incoming low pressure feature, poised to arrive mid week. Models have been shifting precipitation chances around, and are seeing a signal for increased moisture as early as Wednesday afternoon/evening across the southern and eastern highlands. The threat for showers and thunderstorms increases Wednesday night through Friday, possibly continuing into early Saturday as the low shifts across East Idaho.

AVIATION /18Z TAFS THROUGH 18Z TUESDAY/

Issued at 1008 AM MDT Mon Sep 14 2026

VFR conditions expected through the period with mainly clear skies. Winds will be breezy at times this afternoon in the valley terminals, 15-25 kts, but will become light and variable later this evening, through the overnight and into the morning hours on Tuesday.

FIRE WEATHER

Issued at 114 PM MDT Mon Sep 14 2026

Cool temperatures and breezy winds today give way to quieter pattern heading into mid week as ridge rebuilds across East Idaho. Daytime humidities drop into the upper teens across lower elevations, but winds also decrease. Moisture starts to return to East Idaho later in the week, with some indications that portions of the southern and eastern highlands could see showers develop Wednesday afternoon or evening. Higher confidence arrives Thursday into Friday as the next low pressure system works across the region. Daytime humidity rises again with the incoming moisture, as does the chance for breezy winds by Thursday.

PIH WATCHES/WARNINGS/ADVISORIES

Frost Advisory from 3 AM to 9 AM MDT Tuesday for IDZ051>054.