textproduct: Pocatello

KEY MESSAGES

- A few overnight showers across the central mountains and along the Montana border

- High pressure will produce temperatures 5-10 degrees ABOVE AVERAGE most of this week

- Showers will return by next weekend

DISCUSSION

Issued at 1111 AM MST Mon Nov 9 2026

Clouds continue to increase ahead of the next incoming storm. The bulk of that low races by to our north tonight and tomorrow. This will bring some light showers, with any real chance of measurable precipitation across the central mountains. There could be some sprinkles/flurries along the Montana border tomorrow, but that potential is VERY LOW at the moment. Any rain or snow amounts will be very light, and most likely confined to around the Stanley Basin and Frank Church into Lemhi County. There will be some wind gusts around in the 15-30 mph range in some spots. Otherwise, strong high pressure builds until we get to the end of the week. Warm spots through Friday will be in the low to mid 60s, which is 5-10 degrees ABOVE AVERAGE. There is a 20-50% chance of exceeding 65 across portions of the Magic Valley and lowlands toward Oakley and Malta. We will need to be mindful of any inversions that might develop that could temper any warmup, or produce some morning clouds or fog. By next weekend, the pattern switches to general low pressure west of the Divide. We have a system swinging through Saturday, the another late in the weekend and early next week. The first system may arrive as early as Friday evening precipitation-wise, but more likely any impact coming on Saturday. High temperatures at that point drop back into the 40s and 50s.

AVIATION /18Z TAFS THROUGH 18Z TUESDAY/

Issued at 1129 AM MST Mon Nov 9 2026

Weak shortwave is moving through the upper level ridge, producing some cirriform CIGs but little else. Later tonight, a second weak shortwave should trigger some lower level cloudiness, about 10/08Z or later for KPIH, KIDA, KBYI, and KDIJ, about 10/03Z for KSUN. None of the lower clouds should develop a CIG. Shortwave should not have an impact on VSBY.

Weak north-south gradient is producing north to northeasterly wind at the valley airports today. Tonight, the approaching shortwave will mean southwest to west wind during the overnight hours, switching around the normal slope-valley wind phenomenon usually expected. The exceptions are KSUN and KDIJ, where normal afternoon upslope and evening downslope wind development should occur. Most wind at 10KT or less, except KPIH Tue morning, when it may approach 15KT.

PIH WATCHES/WARNINGS/ADVISORIES

None.