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 afternoon winds across the western Snake Plain this afternoon.

- Dry with temperatures trending 5-15 degrees above normal through early next week.

SHORT TERM /Through Friday Night/

Dry near-zonal flow will dominate the region today, while weak disturbances pass to the north and an upper ridge builds over the Southwest. Temperatures will warm to slightly above normal this afternoon, with fair skies expected. A weak W-NW surface pressure gradient will remain in place today and create breezy afternoon winds across the western Snake Plain. The upper ridge will continue to build into the area Thursday into early Friday, promoting calmer conditions with valley temperatures rising into the low-mid 80s. Clouds will increase on Friday while a weak disturbance passes through the area, but precipitation chances remain low.

LONG TERM /Saturday through Wednesday/

Southwest flow aloft will develop Saturday and Sunday as the upper ridge axis shifts west and a weak low pressure approaches the west coast. Valley temperatures will peak in the mid to upper 80s by Sunday with this enhanced southerly flow. Models indicate the weak low will briefly interrupt the ridge and move through the forecast area Monday. While NBM/WPC keep the probability of precipitation near zero, some ensemble members do indicate an increase in precipitation chances at 10-15% over the higher terrain in southwest/central Idaho due to the presence of marginal mid-level moisture. Thereafter, the ridge will rebuild and promote warm, dry, and fair conditions across southeast Oregon and southwest Idaho during mid-week.

AVIATION /06Z Wednesday through Thursday/

Issued 1231 AM MDT WED SEP 30 2026

VFR with mostly clear skies. A 10% chance of fog at KBKE and KMYL this morning. Surface winds: variable less than 10 kt, then SW-NW 5-15 kt late morning/afternoon. Afternoon gusts to 15-20 kt for W Snake Plain. Winds aloft at 10kft MSL: NW 10-20 kt.

KBOI...VFR with clear skies. Surface winds: variable 3-6 kt, then NW 6-12 kt late morning with occasional afternoon gusts to 15-20 kt.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.

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