textproduct: Pocatello

KEY MESSAGES

- Cold temperatures again tonight means Frost Advisories and Freeze Warnings. Same is likely for Monday night, and for some on Tuesday night.

- Weak upper level troughing over the northern Rockies will interact with moisture moving in from the south to generate showers and thunderstorms today.Troughing continues through at least Wednesday night.

- Afternoon slight chance risk of thunderstorms occurs every day through at least Thursday.

DISCUSSION

Issued at 218 AM MDT Sun Apr 26 2026

Today through Tue night. An upper level trough extending westward from an upper level low centered in south central Canada will bring up some unstable and slightly moist air into the Gem State. This will bring a slight chance to likely level of showers into the forecast area for this afternoon, with highest probability of precipitation along the ID-WY border and the eastern ID-UT border. The trough will linger overhead on Mon, then exit on Tue. Leftover instability on Tue will continue some showers and thunderstorms, mostly driven by daytime heating, so highest threat in the afternoon.

Temperatures will warm compared to yesterday, mostly due to no more record cold in the teens as it was Sat morning. Mon temperatures will be about the same as Sun temperatures, both lows and highs. So expect another Frost Advisory or Freeze Warning for the five zones in the district. Tue morning lows will also likely be only slightly warmer than the two previous days, but the afternoon decreasing cloudiness will allow a warming that should prevent the sub-freezing temperatures on Tue night.

Wind should stay below Advisory criterion, but it will still be breezy to windy for both Sun and Mon afternoon. Wind on Tue will be even lighter, mostly breezy.

Wed through Sat. While Wed may be a transition day from wet weather to dry, by Thu an brief upper level ridge will be setting up over the northern Rockies for all solution clusters. Even by Wed temperatures are back to near normal, and by Fri temperatures are solidly warmer than normal. Warming trend continues for Sat. Thunderstorm risk turns negligible after Thu. Wind continues light to moderate this entire 4 day period.

AVIATION /12Z TAFS THROUGH 12Z MONDAY/

Issued at 524 AM MDT Sun Apr 26 2026

Clouds and moisture moving in from the south will trigger some SHSN/SHRA this morning and early afternoon, with PROB30 groups for all airdromes except KSUN. Since KDIJ is possible to have SHSN, some IFR is in those PROB30 groups. KIDA and KPIH are at risk for marginal VFR, while KBYI will likely stay VFR. After the SHRA/SHSN move through, expect improving CIGs. SHSN/SHRA start again shortly after the 27/12Z ending for most of the TAFs.

PIH WATCHES/WARNINGS/ADVISORIES

Frost Advisory until 10 AM MDT this morning for IDZ051-055. Freeze Warning until 10 AM MDT this morning for IDZ052>054.