textproduct: Pocatello

KEY MESSAGES

- Dense Fog Advisory through 10AM this morning for many.

- Remaining dry through the weekend before Monday cold front.

- Unsettled conditions may continue through the Thanksgiving holiday, but no significant impacts are expected at this time.

SHORT TERM /THROUGH SUNDAY/

Issued at 315 AM MST Sat Nov 22 2025

Another morning of low stratus and visibilities down to a quarter of a mile or less in locally dense fog. The Dense Fog Advisory remains in effect through 10 AM MST this morning for the Snake River Plain, eastern Magic Valley, Montana Divide region, Teton Valley, Shoshone region, and Arco/Mud Lake Desert. Anyone traveling now through later morning should be prepared for the possibility of slick spots on roadways and sudden reductions in visibility.

If the stratus manages to clear early enough this afternoon, daytime temperatures should be able to warm into the mid-40s across our valleys, which is just a touch warmer than yesterday's highs. Models indicate less dense stratus and fog tonight into Sunday morning, so overnight temperatures are expected to run a bit colder.

LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/

Issued at 155 PM MST Fri Nov 21 2025

The next shortwave feature arrives late Sunday through early Tuesday, with cold front passage during the day Monday. Current NBM means increase the winds along and behind the front to between 25 and 30 mph with gust potential over 40 mph. Light precipitation appears mainly confined to higher elevations at this time. Cooler temperatures follow Tuesday, with lower elevation highs dropping into the 30s. For the holiday period, models are showing signs of shifting gears again. Although the ensemble clusters agree on a ridge through the western states, some of the deterministic runs are a bit flatter with the flow aloft, leading to energy pushing through the PacNW and producing light precipitation across the northern tier states. Temperatures remain mostly mild, which would keep snow generally above valley floors, and thus limiting impacts for holiday travel concerns for Wednesday through Friday. At least for now.

AVIATION /18Z TAFS THROUGH 18Z SUNDAY/

Issued at 1040 AM MST Sat Nov 22 2025

Satellite imagery shows broad swath of stratus throughout much of the Snake Plain this morning, extending into the Teton and Wood River Valleys. Edges of the stratus shield are showing signs of eroding this afternoon, with conditions already improving at DIJ/BYI/PIH. Will take a little longer for edge of stratus and clearing to reach IDA, and even longer for erosion at SUN as moisture continues to be pushed up the Wood River Valley. But, by late afternoon or early evening, anticipation is for all sites to return to VFR CIGS. There is still moisture present for the development of stratus and fog overnight, but at this time the coverage appears to be patchier in spread. Trended the Snake Plain terminals BYI/PIH/IDA toward MVFR conditions after 06Z tonight, and left wiggle room to trend either way in later forecast updates.

PIH WATCHES/WARNINGS/ADVISORIES

None.