textproduct: Pocatello

KEY MESSAGES

- Next chance of showers and storms on Tuesday/Tuesday night

- Temperatures continue to warm up through the end of the week

- Cooler, breezy, and an increasing chance of showers and storms next weekend

DISCUSSION

Issued at 1142 AM MDT Mon Sep 21 2026

The next chance of rain with thunderstorms will be tomorrow, especially later in the day through tomorrow night. Low pressure will gradually shift over the state in the next 24 hours, then quickly east of the Divide by Wednesday morning. Precipitation amounts are expected to be on the lighter side, even with stronger showers or storms...with best chances outside of the central mountains. Totals should remain under 0.10", with some pockets up to 0.20" where stronger development occurs or multiple storms move over the same area. The potential for more than 0.25" is highest across the southeast and eastern highlands at 20-40%. There is a small bullseye across the central mountains around Copper Basin as well. Otherwise, chances are less than 20%. Otherwise, we are dry today and Wednesday into most of Friday. Low pressure races by to our northwest Friday and Saturday, clipping the central mountains. It does look like we COULD see a few showers or storms across the central mountains, while the rest of eastern Idaho sees cooler temperatures and gusty winds. On its heels, another area of low pressure shifts inland. This will keep us on the cooler side of thermometer, along with seeing some gusty winds and better chance of showers and storms areawide. Confidence is lower on when this starts, and the Blend of Models is showing the same thing. Temperatures Tuesday will be just a couple of degrees cooler than today, but we bounce back toward 70s and even low/mid 80s for midweek. We back of a bit with the low and cold front sweeping through Friday through Sunday about 5-10 degrees.

AVIATION /18Z TAFS THROUGH 18Z TUESDAY/

Issued at 1153 AM MDT Mon Sep 21 2026

No impacts through early morning Tuesday. Mostly clear skies will continue today and into the evening with a gradual increase in mid/high level clouds across the area during the late evening and overnight hours. Winds will remain light into the afternoon Tuesday with sky coverage continuing to increase. Precip Tuesday likely holds off until after 22/18Z where VCSH or VCTS will need to be introduced on subsequent forecasts. KSUN forecast already shows this potential.

FIRE WEATHER

Issued at 1153 AM MDT Mon Sep 21 2026

Dry conditions today with continued warming trend. Best chance for showers and isolated thunderstorms this week will be Tuesday through Tuesday night. Best chances in zones 427, 413, 410 and 411 but just about anywhere could see some activity tomorrow. Not expecting significant precipitation with the system however and widespread wetting rainfall will be limited. General trend through the week is continued warm temperatures through the weekend with well above normal conditions Thursday and Friday. Friday will also bring the likely strongest winds of the week as a system moves through to the north and may drag through a week cold front. Overall, not expecting significant impacts through the week.

PIH WATCHES/WARNINGS/ADVISORIES

None.