textproduct: Boise

KEY MESSAGES

- Isolated showers and thunderstorms in the central Idaho mountains tapering off after sunset.

- Cold morning low temperatures on Wednesday and Thursday, bringing light snow above 5500 feet in the West Central Mountains on Wednesday morning. - Breezy wind gusts up to 40 mph in south-central Idaho Wednesday afternoon. - Dry and gradually warmer Thursday through Monday.

SHORT TERM /Through Thursday Night/

A trough that brought breezy westerly winds and isolated showers and thunderstorms this morning will continue to move east this evening. Breezy westerly winds will continue through the evening, with high terrain in the central Idaho still seeing a 20-30% chance of lingering showers through the night. Temperatures will cool down about 5-10 degrees tomorrow, with overnight lows in high terrain near freezing. This will bring isolated snow showers to the central Idaho mountains as well, with snow levels dropping to 5500-6500 feet MSL by tomorrow morning. Minimal, if any, accumulations are expected. Conditions will dry tomorrow, with breezy wind gusts up to 35-40 mph in south-central Idaho by the afternoon. As the trough moves east tomorrow, a ridge of high pressure will build over the eastern Pacific early Thursday, bringing a steady warming and drying trend through the weekend.

LONG TERM /Friday through Tuesday/

Ensemble guidance remains in excellent agreement regarding the synoptic evolution through the extended period. A broad upper- level trough will remain anchored over the Pacific Northwest, keeping southeast Oregon and southwest Idaho under a persistent cold cyclonic flow. This pattern will suppress any substantial thermodynamic warming and keep convective potential minimal, though daytime heating could trigger a few terrain- induced clouds each afternoon. The latest NBM and NWS forecast continue to exhibit their typical warm bias, significantly overestimating daytime highs given the seasonably low 500 mb heights present in the cluster analysis. Thus, temperatures throughout the long term period will remain very close to climatological normals for mid-June. Expect afternoon maximums to hover in the low 80s across the lower valleys, while the higher elevations and mountain communities peak in the upper 60s. No high-impact weather systems are anticipated through early next week.

AVIATION /18Z Tuesday through Wednesday/

Issued 1149 AM MDT TUE JUN 9 2026 Isolated showers and thunderstorms continue north of the Snake Basin in Idaho through 10/03Z. Gusty winds and brief heavy rain expected with the strongest showers especially near KMYL. Patchy fog and brief IFR in mountain valleys after 06Z. Surface winds...SW-NW 15-25kt. Afternoon gusts 30 kt in the Snake Basin. Gusts to 35 kt in thunderstorms. Winds aloft at 10kft MSL...W 20-25kt.

KBOI...VFR. Scattered clouds around 10 kft. Surface winds...NW 12-15kt. Gusts to 25 kt through 10/03Z.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.