textproduct: Boise

KEY MESSAGES

- Gusty winds and showers diminish this evening.

- Colder tonight and Sunday, with sub-freezing low temperatures in all areas, then rapid warming Monday.

- An early season heat wave will lead to record high temperatures and dry conditions Tuesday through Saturday.

SHORT TERM /Through Monday Night/

Winds and showers will gradually diminish through sunset this evening as lower levels decouple from flow aloft and the upper dynamic support shifts east of the area. Areas in the Snake Plain east of Mtn Home and typically windier spots in eastern Oregon will stay breezy with gusts of 20 to 30 mph into Sunday morning. The northwest winds will usher in colder air, and brief clearing overnight will allow for temperatures to drop below freezing across the region. Clouds return on Sunday as a warm front moves in aloft. The e-central Oregon and w-central Idaho mtns will see a chance of light precipitation Sunday night and Monday as the warm front lifts NEward. Most of the measurable precipitation will fall across northern Baker, Adams and Valley counties which hold a 50-80% chance. Precipitation chances fall off to 15-30% over the Boise Mtns to less than 10% in the Snake Plain and rest of SE Oregon and SW Idaho on Monday. Temperatures will be quick to warm on Monday, up 10-15 degrees across northern mtns (where precipitation chances are highest), and 15-20 degrees across southern areas. The result will be highs of 60-70 degrees across lower elevations and 45-55 degrees in mtn valleys.

LONG TERM /Tuesday through Saturday/

An anomalously strong upper-level ridge (for this time of year) will continue to build over the Desert Southwest and Intermountain West. Clusters, ensembles, and climatological comparisons are all painting a deceptively early season heat wave. Daily maximum temperatures (ever recorded) for all sites will be threatened throughout the long term. Nightly minimum temperatures will also be much warmer than normal.

Tuesday will be 15 to 20 degrees above normal, with following days rising to 20 to 25 degrees above normal. Locations in the valleys will see afternoon high temperatures in the upper 70s to low 80s. Temperatures in desert highlands will be a few degrees cooler, and much cooler in the mountains of Central Idaho down to the upper 50s and lower 60s. Winds remain mild, and skies will stay partly cloudy. Afternoon relative humidity values are expected to range from 20 to 30% in the lowlands and 30 to 50% in the mountains.

AVIATION /18Z Saturday through Sunday/

Issued 1223 PM MDT SAT MAR 14 2026 A cold front is bringing a band of showers through the area, moving from NW-SE, through early evening. Localized MVFR conditions in precipitation and blowing dust. Showers remain into mid evening behind the front over the West-Central Idaho mountains. Less than a 10% chance of lightning in showers along the front. Snow Levels: 4-6 kft MSL, lowering to valley floors behind the front this evening. Surface winds: W-NW 15-30 kt with gusts to 25-50 kt, strongest near KTWF/KJER. Winds aloft at 10kft MSL: W-NW 35-55 kt

KBOI...Light to moderate rain in showers along the front, clearing by mid-afternoon. Surface winds: NW 20-30 kt with gusts up to 40 kt. Winds decrease in strength after sunset.

Sunday Outlook...VFR under mid-high clouds. Ceilings lowering and showers returning to E Oregon and the central ID mtns late Sun/PM. Surface winds: variable 5-10 kt, with W-NW gusts to 20 kts near KTWF/KJER.

BOI WATCHES/WARNINGS/ADVISORIES

ID...Wind Advisory until 9 PM MDT this evening for IDZ011>013-029- 033. High Wind Warning until 9 PM MDT this evening for IDZ014>016- 028-030. OR...Wind Advisory until 9 PM MDT /8 PM PDT/ this evening for ORZ061>064.