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.

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Mostly dry through Monday (Memorial Day) with temperatures10 to 15 degrees above normal. Isolated late day/evening thunderstorms near the ID/NV border today and again Monday.

- Gusty winds Monday ahead of a Pacific cold front, resulting in elevated fire weather conditions in eastern Oregon.

- Much cooler with gusty winds and a chance of showers and thunderstorms Tuesday through Friday.

SHORT TERM /Through Tuesday Night/

Issued 216 AM MDT SUN MAY 24 2026 Latest models still show Monday the warmest day before a strong surface cold front comes in ahead of a deep upper low currently in the Gulf of Alaska 50N/152W. Models continue to adjust the track of the upper low westward, now forecast on the northern OR coast Monday night, then SSE-ward through Oregon Tuesday, to NW Nevada Tuesday night. The surface cold front should therefore be slower to pass through our CWA, now estimated through SE Oregon Monday night and SW Idaho Tuesday morning. In addition, ahead of the front Sunday and especially Monday will be increasingly windy, with enough mid-level moisture for isolated late afternoon/evening thunderstorms near the ID/NV border. Pre- frontal wind and low-humidity will increase fire danger in SE Oregon, especially on Monday. Behind the cold front Tuesday will average 25 degrees cooler than Monday, but wind speeds have been slightly lowered from previous forecast.

LONG TERM /Wednesday through Sunday/

Issued 216 AM MDT SUN MAY 24 2026 Model forecasts of the upper low have changed since last night. Last night's models took the low across NV Wednesday and Thursday, and into Colorado Friday. Today's models keep the low stationary in nw NV through Thursday, then into southern ID Friday and Saturday as a weakening upper trough. This change keeps our CWA relatively cool and showery all week instead of warming and drying as previously forecast toward the weekend.

AVIATION /18Z Sunday through Monday/

Issued 1124 AM MDT SUN MAY 24 2026 VFR with showers/thunderstorms possible between 22-04Z near TWF/JER. Afternoon cloud build-ups over terrain elsewhere this afternoon. Surface winds becoming WNW 6-12 kt with winds less than 10 kt expected this evening and overnight. Strong cold front to bring gusty winds and a chance for precipitation late Monday. Winds aloft at 10kft WNW 20-30 kt.

KBOI...VFR with some mid/high clouds today. Increasing winds late Monday with precipitation anticipated Monday evening into Tuesday. Surface winds WNW 6-10 kt, becoming ESE less than 10 kt after 04Z.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.

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