textproduct: Pocatello

KEY MESSAGES

- Heat expected through the weekend with many locations nearing or reaching 100 degrees Saturday and Sunday. heat Advisories and Excessive Heat Warnings have been issued for many areas.

- Drier weather returns today through the weekend.

DISCUSSION

Issued at 111 PM MDT Thu Jul 9 2026

Main impact will be the heat expected to come. Friday will be quite hot with highs low to mid 90s lower elevations and 80s mountains. By Saturday through Monday many low elevation high temperatures will reach 100 degrees with the mountains in the 80s to lower 90s. Many heat warnings and advisories have been issued for Saturday and Sunday. Will see some slight cooling at monsoonal moisture returns Tuesday through Thursday as the upper ridge pushes east and there is a chance for showers and thunderstorms returning with the increased moisture. Even though slightly cooler it remains hot with above normal temperatures in the Tuesday through Thursday time frame. Low to mid 90s expected in the lower elevations and still mainly 80s in the mountains.

AVIATION /00Z TAFS THROUGH 00Z SATURDAY/

Issued at 433 PM MDT Thu Jul 9 2026

High pressure and synoptic subsidence is keeping skies from having CIGs with much of the time SKC until Fri afternoon. Then KBYI may experience cirriform CIGs. Also, possible SHRA afternoon at KBYI and KPIH. With bases barely getting to FL100, would not expect much to reach the ground. Possible TSRA just beyond the forecast period for KDIJ and KIDA.

With no weather around, VSBY should be unlimited. Wind will have a lot of VRB04 or less time, with some evening wind up to 15KT and G20KT, then again Fri afternoon. When it has enough speed for a direction, should be mostly slope-valley driven phenomenon.

FIRE WEATHER

Issued at 1224 PM MDT Thu Jul 9 2026

Isolated showers and thunderstorms still possible today and Friday afternoon, but coverage and intensity should be much lower than previous afternoons as moisture continues to wane. Any brief shower or thunderstorm could still produce gusty and erratic winds, but this will be more of an exception than the rule.

The ridge of high pressure advertised for several days will establish over the next 24 hours or so, bringing much warmer temperatures to the area and drier conditions overall. We'll see temperature climb from near or slightly above average today to 10-15 degrees above average by Saturday and Sunday. RH values will drop to values firmly in the low teen to single digits each afternoon. Overnight lows will be much warmer than usual as well, limiting overnight recovery over the weekend. Winds will generally be light today and Friday, but begin to increase Saturday and Sunday. These will be the next critical fire weather days as fuels continue to dry out and cure from any recent rain they may have received.

The ridge generally sticks around into early next week, but we begin to see monsoonal moisture wrap around the western edge of the high, bringing precipitable water values back up leading to better coverage of afternoon showers and thunderstorms, but also limiting RH minimums.

PIH WATCHES/WARNINGS/ADVISORIES

Heat Advisory from noon Saturday to 9 PM MDT Sunday for IDZ051>055-060>068-070-075. Extreme Heat Warning from noon Saturday to 9 PM MDT Sunday for IDZ056>059.