textproduct: Pocatello

KEY MESSAGES

- Showers East of I-15: A brief round of showers and isolated thunderstorms today primarily along and east of the I-15 corridor, focusing over the Eastern Highlands.

- Noticeably Cooler Today: Showers exit rapidly today with clearing skies. Post-frontal air will drop valley daytime highs into the 60sroughly 10 degrees cooler than yesterday's readings.

- Early October Warming Trend: High pressure builds over the Intermountain West starting Wednesday, keeping the remainder of the 7-day forecast completely dry while pushing lower- elevation highs into the mid-to-upper 70s by late week.

DISCUSSION

Issued at 243 AM MDT Mon Sep 28 2026

Upper-level trough will continue shifting eastward today, with showers and isolated thunder across eastern Idaho through this evening. Expect a 10 degree cooldown for many locations between yesterday's daytime temperatures and today's, with highs only warming into the 50s and 60s for much of the forecast area. Models suggest high pressure building in from the west beginning Tuesday, remaining in control of the pattern through the end of the extended timeframe. This will mean dry conditions for the next week and gradual warming. Daytime temperatures will warm into the low to mid- 70s across low elevations by Thursday with some locations likely reaching 80 degrees by early next week.

AVIATION /18Z TAFS THROUGH 18Z TUESDAY/

Issued at 1124 AM MDT Mon Sep 28 2026

Isolated showers and thunderstorms will continue throughout the forecast period, but best chance for anything to actually impact a terminal will be at DIJ where the PROB30 remains. Elsewhere, there may be some vicinity showers or VCTS even, but the probability remains low enough to keep out PROB30s for the other sites. Otherwise, we dry out overnight and look completely dry for Tuesday. Given the precipitation chances at DIJ and cooler temperatures overnight, look for FEW to SCT low clouds early Tuesday, but at this point VFR conditions are expected to prevail.

FIRE WEATHER

Issued at 243 AM MDT Mon Sep 28 2026

Upper-level trough will continue shifting eastward today, with showers and isolated thunder across eastern Idaho through this evening. Activity will favor the east and southeast highlands. Expect a 10 degree cooldown for many locations today, with highs only warming into the 50s and 60s for much of the area. A weak ridge will build in from the west beginning Tuesday and remain in control of the pattern through the beginning of next week. This will mean dry conditions and gradual warming. Daytime temperatures will warm into the low to mid-70s across low elevations by Thursday with some locations likely reaching 80 degrees by early next week.

PIH WATCHES/WARNINGS/ADVISORIES

None.