875
FXUS65 KPIH 202325
AFDPIH

Area Forecast Discussion
National Weather Service Pocatello ID
525 PM MDT Sun Sep 20 2026

.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 /00Z TAFS THROUGH 00Z TUESDAY/...
Issued at 525 PM MDT Sun Sep 20 2026

The last gasp of the recent upper low is rotating through the
northeast corner of East Idaho still this afternoon per per
satellite imagery. Swath of mid level cloud cover moving through the
region will slowly shift east by midnight. VFR conditions all
airports through tomorrow with light wind.  Quickl moving storm
system will affect the area Tuesday afternoon into Wednesday morning
with showers and a few thundertorms Tuesday evening producing gusty
winds and mvfr conditions.

&&

.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.

&&

$$

DISCUSSION...Keyes
AVIATION...Preston
FIRE WEATHER...DMH