textproduct: Pocatello

KEY MESSAGES

- Mostly Dry Conditions Through Friday Morning

- Pockets of Frost, Fog, and Stratus Tomorrow Morning

- Showers and Storms Possible Tuesday and by the Weekend

DISCUSSION

Issued at 1205 PM MDT Sun Sep 20 2026

Low pressure continues to churn east across the Central High Plains with limited moisture wrapping back into Montana and Idaho. We still see a few showers across the eastern highlands and the far north end of the Snake Plain. The chance is around 15% at best, if anything develops other than the current cloud cover in that area. Last night, we saw a few pockets of frost, fog, and low clouds around central and eastern Idaho. We will likely see that again tonight. We will also see a repeat of localized light freeze conditions in our colder valleys, although it will be just a couple of degrees warmer overall.

The forecast will be dry tomorrow and most of Tuesday, and then again most of Wednesday through Friday morning. In between, another low offshore will shift northeast and across Idaho later Tuesday and Tuesday night. This will bring some light rain and likely a few thunderstorms our way. That should be out of here earlier on Wednesday and lead to another short dry period for us. By Friday afternoon and next weekend, a couple of storms will bring some impacts to central and eastern Idaho. Low #1 will mainly produce some precipitation over the central mountains and along the Montana border, and gusty winds for the rest of the area. Low #2 at the moment appears to potentially increasing shower and thunderstorm potential everywhere, especially once we get beyond next weekend. Temperatures will begin to climb throughout the week, with some low to mid 80s returning across our lower valleys. Temperatures quickly back off starting Friday, back into the 60s and 70s for valley locations.

AVIATION /18Z TAFS THROUGH 18Z MONDAY/

Issued at 1130 AM MDT Sun Sep 20 2026

The last gasp of the recent upper low is rotating through the northeast corner of East Idaho this morning per satellite imagery. Swath of mid level cloud cover moving through the region. All early morning stratus has eroded, leaving VFR skies in places. Low expected to shift east through the evening, leaving clearing in place for the overnight into Monday morning. Winds remain light.

FIRE WEATHER

Issued at 1130 AM MDT Sun Sep 20 2026

Some cloud cover lingers across portions of the Targhee and northern Snake Plain regions this morning, but conditions should remain dry through Monday. A weak system shifting out of the Great Basin Tuesday brings potential for mainly isolated showers and thunderstorms to portions of the region. The rest of the week should remain generally dry for most areas. Expect a gradual warming trend through the week, with light winds.

PIH WATCHES/WARNINGS/ADVISORIES

None.