textproduct: Pocatello

KEY MESSAGES

- Lake Wind Advisory for the American Falls Reservoir this afternoon and evening due to breezy to windy conditions.

- Weak trough moving through eastern Idaho today brings in cooler air for Saturday, then gradual warming through Tuesday.

- Second trough on Tuesday night/Wednesday cools temperatures again.

DISCUSSION

Issued at 201 AM MDT Fri Jun 12 2026

Upper level low over western Canada will swing a weak trough through eastern Idaho today. This will increase wind enough to create some blowing dust and rough waters on the American Falls Reservoir. So a Lake Wind Advisory for the reservoir was issued for today. There is a wind shift that starts tonight to the northeast, and the wind increases to the point that a Lake Wind Advisory will be needed again on Sat and Sun, because of northeast wind exceeding 8KT. Otherwise wind is staying below warning and advisory thresholds.

This trough is so dry that few clouds will move through the region. The only area expecting to see a risk of showers, and it is still very low, is the northeast corner of Fremont County in the extreme northeast portion on Sat and Sat night. Other days and locations are expected to be dry.

Temperatures will cool down thanks to the northerly wind expected during the day Sat, then a gradual warming through Tue, with low 90s possible in the eastern Magic Valley and Snake River plain by then. Yet another dry trough and surface cold front brings high temperatures down again for Wed and Thu, but still staying above normal.

AVIATION /12Z TAFS THROUGH 12Z SATURDAY/

Issued at 452 AM MDT Fri Jun 12 2026

Although a trough will be passing through the region today and tonight, the air is so dry that not even much cloud cover is expected until late tonight along the divide, affecting only KDIJ. So no CIG of concern and VSBY should be unlimited as well.

Which leaves wind shifts. While strong wind is expected in the northern part of the eastern Magic Valley, current NBM and HRRR indicate light wind for KBYI, in the southern portion of the Magic Valley. Expect G30KT at KIDA and G25KT at KPIH for the late afternoon and early evening. Expect G20KT in the mid- evening at KSUN once the trough shifts winds to northwest and north. Otherwise wind should stay at sustained 15KT or less. Only KDIJ and KSUN appear to go variable tonight, with the other three staying elevated at 8KT to 15KT.

FIRE WEATHER

Issued at 201 AM MDT Fri Jun 12 2026

Dry cold front moving through during the day will bring gusty windy and continued low humidity. If the fuel conditions were more critical, the eastern Magic Valley, Zone 425, would be under critical fire weather conditions. The southern Sawtooth NF, Zone 427 ahs some limited areas for two hours reaching critical fire weather conditions, so the borderline conditions that are slightly below thresholds for time and coverage means no Red Flag Warning for today/tonight.

Humidity will continue low, with lower elevations hovering around the 15 percent critical threshold in the southwest quadrant and valleys in the Salmon-Challis NF. With limited risk of showers and even cloudiness, minimum humidity gets into single digit range by Wed and Thu. With a trough moving through Tue Night/Wed, Red Flag conditions appear to be possible at that time.

PIH WATCHES/WARNINGS/ADVISORIES

None.