788
FXUS65 KPIH 201229
AFDPIH

Area Forecast Discussion
National Weather Service Pocatello ID
529 AM MST Thu Nov 20 2025

.KEY MESSAGES...

- Isolated to scattered rain and snow showers again today
  across the mid to high elevations, favoring north-central
  Idaho.

- Temperatures very similar yet again today, up to around 10
  degrees above climatological norms, becoming cooler Friday
  through the weekend.

&&

.SHORT TERM /THROUGH TONIGHT/...
Issued at 340 AM MST Thu Nov 20 2025

We are monitoring some pockets of dense fog/freezing fog early this
morning in the Marsh, Cache, and Bear Lake Valleys, with area
observations and webcams indicating visibilities below one quarter
of a mile at times. The areas particularly affected are the corridor
from McCammon heading south along I-15 and US-91 and along US-30
from Montpelier south. Considering coverage is not widespread enough
to warrant an advisory, we have issued a Special Weather Statement
for these zones through late morning. With temperatures below
freezing across much of these areas, ice accumulation on roadways
remains possible. At this time though, grip levels are holding well
with roads reported to be wet but not slick. That said, anyone
traveling these corridors should be prepared for slick spots and
sudden drops in visibility.

Outside of fog, Southeast Idaho will see a continuation of rain and
snow showers again today before conditions trend much drier heading
into Friday. CAMs suggest different scenarios with regard to the
placement of isolated to scattered showers, but the overall idea is
that all mid to high elevations could see showers today. The best
chances and most accumulation will be in north-central Idaho, with
only very slight chances for rain showers across the Snake River
Plain. Snow levels between 6,500 and 7,000 feet will allow for a
couple additional inches of snow to accumulate along Galena Summit
and up to five inches above pass level.

Daytime temperatures will again feel almost like a repeat of
yesterday, spanning the low 50s across most of our valleys and 30s
and 40s in the mountains and mid-elevations/mountain valleys,
respectively. Some of us may notice a difference in our overnight
temperatures though, as skies start to clear tonight and radiational
cooling sends more of the region to right around or below
freezing.

&&

.LONG TERM /FRIDAY THROUGH WEDNESDAY/...
Issued at 121 PM MST Wed Nov 19 2025

No major changes in the long term forecast at this point. By
Friday, an area of low pressure will be situated over southern
California. For us, this will mean a few isolated showers
lingering in the Eastern Highlands, but generally dry conditions
and highs in the 40s. Weak ridging moves into Eastern Idaho for
the weekend and temperatures warm just a couple of degrees each
afternoon, putting us back to near 50 degrees by Monday
afternoon ahead of a cold front. This front will pass through
the area late Monday into Tuesday and bring about a 30 to 40
percent chance for precipitation to the mountains and cooler air
for all. This will drop our highs from 40s and low 50s on
Monday to mid 30s and low 40s on Tuesday. Look for winds to pick
up with this frontal passage with gusts around 20-30 mph.

&&

.AVIATION /12Z TAFS THROUGH 12Z FRIDAY/...
Issued at 529 AM MST Thu Nov 20 2025

Have maintained general trends from previous forecast, including
VCSH at KPIH, KBYI, and KSUN today with a TEMPO for -SHRA at KSUN
through 18z. CAMs all differ a bit regarding placement of showers,
but generally favor the same areas. Have refrained from including
any wx at KDIJ as probability of precipitation is too low to
include. Forecast maintains VFR-MVFR CIGs through the period with
light winds.

&&

.PIH WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

SHORT TERM...Cropp
LONG TERM...AMM
AVIATION...Cropp