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 /06Z TAFS THROUGH 06Z TUESDAY/

Issued at 1014 PM MDT Sun Sep 27 2026

VFR conditions will likely continue at all sites through the forecast period. Moisture spreading into the region will allow for -SHRA/SHRA to develop across the region this evening around midnight. With any heavier showers, MVFR conditions are possible. The best chances for predominate -SHRA/SHRA will be at DIJ, PIH, and IDA this evening into early morning, but carry VCSH at all sites. Have kept PROB30 for -TSRA for DIJ, PIH, and IDA for this evening around midnight. However, -TSRA is not that likely. Precipitation shifts east of the region during the morning Monday. Expect a break in precipitation by early to mid morning with another chance of showers for PIH, IDA, SUN, and DIJ tomorrow afternoon. Have kept in VCSH for PIH, IDA and SUN for tomorrow afternoon. There is a slight chance of thunderstorms tomorrow afternoon as well. Have added predominate showers and a PROB30 for -TSRA for DIJ for tomorrow afternoon. Other sites may need a PROB30 for thunderstorms for tomorrow afternoon as well.

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.