textproduct: Boise

This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.

KEY MESSAGES

- Breezy and slightly cooler Monday.

- Very hot Tuesday. Record high temperatures in the mid to upper 90s in the lower valleys.

- Low pressure system arriving Wednesday will bring a cooling trend and chances of showers/thunderstorms.

SHORT TERM /Through Wednesday Night/

A dry cold front passing over our area early morning will bring slightly cooler temperatures and breezy northwest winds over the Snake Plain today. By early Tuesday, a strong ridge will build over the entire western CONUS. Considerably warm temperatures are expected Tuesday, with lower-elevation valleys expected to see peak temperatures in the lower to mid 90s; max temperatures were adjusted slightly downward from the previous discussions.

A Pacific upper low will begin moving inland early Wednesday. There is slight guidance uncertainty over the exact arrival timing and behavior of this system as it approaches our area, but there is strong agreement on showers and thunderstorms expected Wednesday. Areas will generally see a 40-60% chance of showers and a 20-30% chance of thunderstorms Wednesday afternoon/evening. This system's arrival will begin a cooling trend starting Wednesday.

LONG TERM /Thursday through Monday/

An upper level trough will track across the Pacific NW on Thursday. Still some major differences in the positioning of this trough so forecast confidence is low. A couple of the models have the trough tracking across northern NV into southwest ID which would be much wetter and cooler than the current forecast. If this trough track comes to fruition, wetting rains possible for much of the area with 0.25 to 0.75 inch of precipitation for southeast OR and southwest ID. Eventually the models agree on cooler temperatures for Sunday and Monday of next week with temperatures 5 to 10 degrees below normal and snow levels of 5000 to 6500 feet MSL. Showers will mainly be confined north of a line from Baker City OR to McCall ID.

AVIATION /06Z Monday through Tuesday/

Issued 1157 PM MDT SUN MAY 10 2026 VFR. Surface winds: NW 5-15 kt. Gusts 20-30 kt KBKE-KONO-KTWF corridor through 18Z, then KMUO-KTWF after 18Z. Winds aloft 10kft MSL: W-SW 15-25 kt.

KBOI...VFR. Surface winds NW 5-10kt with gusts to 20kt Mon afternoon.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.

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