textproduct: Pocatello

KEY MESSAGES

- Cold temperatures at night will again challenge the freezing mark tonight and Sunday night. A combination of Frost Advisory and Freeze Warning is in place tonight for the Snake Plain.

- Weak low pressure over the northern Rockies and the Great Basin continue to threaten very light precipitation

- Slow warming will get temperatures near normal on Tuesday.

DISCUSSION

Issued at 116 PM MDT Sat Apr 25 2026

Complex upper low remains in place over south central Canada today. Strong shortwave rotating south around the low across the PacNW is expected to pick up moisture extending northeast out of low off California coast. That moisture arrives after midnight tonight across the southern and southeast highlands, spreading north through most of East Idaho (mainly east of a line from Sun Valley to Challis) during the morning as the next northern shortwave feature arrives. Overnight temperatures remain cold, with a mix of FROST ADVISORY and FREEZE WARNING through the Snake Plain. Any precipitation that falls early enough will be snow even to valley floors, though accumulations will be limited to areas generally above 5000 ft elevation. Precipitation retreats to higher elevation areas only by mid- day, but continues into Tuesday especially across the north as the trough stalls across Western Montana. Total accumulations across the Bear River Range and the Divide are generally 3-6" through Monday night where uplift is maximized. Other higher elevation areas look to be much less, in the 1-2" range. Temperatures remain cold Monday night, and another mix of FROST ADVISORY and FREEZE WARNING is anticipated.

For Tuesday and beyond, deterministic models are tending to push the deep Canadian low east, slowly. The Northern Rockies and East Idaho remain under the influence of shallow trough connected to the Canadian low, and loosely connected to the closed low off the California coast. These features slowly shift east by late in the week ahead of pair of lows coming off the Pacific by early weekend. Ensemble clusters pick up the pattern in general, but continue with differences in the details. Thus there should be a transition from unsettled to briefly drier conditions Thursday and Friday, with showers returning by the weekend. That said, isolated showers and a thunderstorm or two may be possible each day over some portion of the region. Temperatures trend warmer, but may remain cold enough to support cold-related headlines at times through the Snake Plain for most of the week.

AVIATION /00Z TAFS THROUGH 00Z MONDAY/

Issued at 543 PM MDT Sat Apr 25 2026

Not expecting significant impacts through Sunday afternoon. Will have widespread VFR conditions through the period with only some scattered to broken mid and high level cloud cover. Will see some moisture moving northeast from an upper-level trof over Utah Sunday morning and did put vicinity showers for DIJ for the afternoon tomorrow. Still think most precipitation stays south of all TAF sites but DIJ could see some vicinity showers. Look for overall light winds this evening through tomorrow morning before expecting slightly breezy winds tomorrow afternoon with gusts up to around 20 kts.

PIH WATCHES/WARNINGS/ADVISORIES

Frost Advisory from midnight tonight to 10 AM MDT Sunday for IDZ051-055. Freeze Warning from midnight tonight to 10 AM MDT Sunday for IDZ052>054.