textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Cold morning low temperatures today and Thursday, with light snow above 5500 feet in the West Central Mountains this morning. - West/northwest winds 25 to 35 mph with gusts 45 to 55 mph in south-central Idaho this afternoon and early evening.

- Isolated showers and thunderstorms in the central Idaho mountains this afternoon. - Dry and gradually warmer Thursday and Friday, leveling off Saturday and Sunday, then warmer again Monday.

SHORT TERM /Through Friday Night/

Issued 255 AM MDT WED JUN 10 2026 An upper trough, containing two short wave troughs, continues over the northern Intermountain Region. The first short wave trough moved east of our CWA late Tuesday after bringing showers and modest cooling Tuesday. The second trough will pass through our CWA later today, with the main impact being strong winds in southern Idaho this afternoon. A Wind Advisory has been issued valid noon to 9 PM MDT, due to a tight west-to-east surface pressure gradient beneath strong west winds aloft from the second trough. Strongest gusts at the surface, 45 to 55 mph, are forecast in the Snake Basin between Mountain Home and Twin Falls between 1 PM and 5 PM MDT. Areas of blowing dust will briefly reduce visibility to 1 or 2 miles. The Camas Prairie should also have gusts at least 50 mph this afternoon. Boise will be on the western edge of the Advisory area with gusts 40 to 45 mph mid-afternoon. Moisture will be minimal, however, with only scattered light rain and snow showers and isolated afternoon thunderstorms in northernmost mountains.

The second trough will exit east this evening and winds will die down rapidly leaving clear skies, dry air, and light winds by morning, ideal for radiational cooling. Low temps Thursday morning will dip to the upper 20s to mid 30s in the mountains, and mid 30s to lower 40s in the valleys. However, Thursday will end up 8 to 15 degrees warmer than today as high pressure aloft builds rapidly inland from the Pacific. Twin Falls County will be the last to warm as that area will still be close to the exiting trough. Friday looks another 10 degrees warmer CWA- wide, and Friday night generally 4 to 8 degrees warmer than Thursday night, under clear skies.

LONG TERM /Saturday through Wednesday/

Issued 255 AM MDT WED JUN 10 2026 Another short wave trough is forecast to come in from western Canada Saturday stopping the warming trend, with Saturday and Sunday highs holding close to normal. Central Idaho may even cool several degrees. That trough will exit east Monday and another warming trend will begin.

AVIATION /12Z Wednesday through Thursday/

Issued 548 AM MDT WED JUN 10 2026 Scattered showers and low VFR ceilings (briefly MVFR) near KBKE and KMYL until 20Z. Patchy fog and brief IFR in mountain valleys through 10/16Z. Small (10-15% chance) of thunderstorms near KMYL this afternoon. Surface winds...W-NW 10-20 kt this morning increasing to 20-30 kt this afternoon through 11/03Z. Afternoon gusts to 45kt at KJER and KTWF with areas of blowing dust and local visibility 1-2 miles. Gusts to 35 kt at KBOI, and 25 to 30 kt at KBNO and KBKE. Gusts 30-40 kt in thunderstorms. Winds aloft at 10kft MSL...W 35-40kt until 21Z then NW 30-35 kt.

KBOI...VFR. Scattered clouds, Surface wind NW increasing to 15-25 kt by 18Z, then 20-25 kt with gusts up to 35 kt through 11/02Z, then decreasing rapidly.

BOI WATCHES/WARNINGS/ADVISORIES

ID...Wind Advisory from noon today to 9 PM MDT this evening for IDZ014>016-028-030. OR...None.