textproduct: Pocatello

KEY MESSAGES

- Above average temperatures will continue, even with any cooling trends coming next week

- Sunday will be the last totally dry day across central and eastern Idaho

- Best chance of rain and snow comes by the middle of next week

SHORT TERM /THROUGH SUNDAY NIGHT/

Issued at 1237 PM MST Sat Dec 13 2025

High pressure shifts over the state and quickly east by later Sunday. Dry weather will continue. We did see a little bit of fog especially north of Idaho Falls near Camas/Market Lake. There was some support for that last night in the HREF and REFS models. There is a hint it could happen again, but support is much lower for it. We will leave it out due to that, but something localized like that is certainly possible again tonight and Sunday morning. Temperatures running 10-20 degrees above average will also persist tomorrow, and actually through at least the early part of the upcoming week. We are running a bit cooler than yesterday, especially where inversions are holding up a bit longer today. That said, we will be flirting with a few record highs today and again Sunday.

LONG TERM /MONDAY THROUGH SATURDAY/

Issued at 1237 PM MST Sat Dec 13 2025

Remnants of upper ridge finally shift east during the day Monday, allowing moisture to spill into East Idaho. Precipitation remains generally focused over the central mountains and along the Wyoming border late Monday through Tuesday. Deeper moisture arrives Tuesday night through Wednesday, and has better chances of spreading across more of the region during this time frame. The mild temperatures continue, and snow levels are 6500-7000 ft (or above across the southern zones) to begin the event. Cooler temperatures spill into East Idaho during the day Wednesday, bringing snow levels to 5000- 6000 ft by late in the day. The daytime highs could be early in the day, resulting in a rain/snow mix to valley floors in some areas by afternoon. By the time temperatures cool enough to support snow at lower elevations during the overnight, the bulk of the precipitation should be over with only lingering light snowfall at higher elevations. Thus valley accumulations look to remain non-existent at this point. Following a brief break in the precipitation, the next moisture push arrives late Thursday and continues at least through Friday, possibly Saturday depending on how the features time out that far out in the extended. Daytime temperatures remain quite mild, so we are still expecting minimal accumulations, at best, at lower elevations. There appears to be relative agreement on the pattern via the ensemble clusters, despite some mild differences in amplitude of the features and precipitation amounts.

AVIATION /06Z TAFS THROUGH 06Z MONDAY/

Issued at 935 PM MST Sat Dec 13 2025

High pressure dominating. Zero impact to aviation operations at any aidrome tonight or tomorrow. Wind staying below 10KT, cirriform clouds, if any, at FEW coverage. Unlimited VSBY.

PIH WATCHES/WARNINGS/ADVISORIES

None.