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
- Warm and dry conditions through the weekend with temperatures 5 to 10 degrees above normal Friday and Saturday.
- Active pattern returning cooler conditions and precipitation chances Wednesday through Thursday.
SHORT TERM /Through Saturday Night/
An upper level ridge over the western United States will remain the dominant weather feature across southeast Oregon and southwest Idaho through Friday night. This will keep atmospheric conditions stable, resulting in clear skies, light surface winds, and temperatures running roughly 5 to 10 degrees above seasonal norms. Dry surface layer conditions will also contribute to mild afternoons and efficient radiational cooling at night. By Saturday, a weak shortwave trough moving inland across the Pacific Northwest will begin to erode the western periphery of the ridge. While moisture remains sparse with this system, the pressure gradient will tighten slightly to generate localized afternoon breezes.
LONG TERM /Sunday through Thursday/
Sunday and Monday, temperatures remain about 5 to 10 degrees above normal. A weak cold front on Sunday cools temps a few degrees from Saturday. Through the rest of the week, a high amplitude trough becomes a cut off low in southern California. As the trough builds along the West Coast Monday evening, increasing clouds and some breezy conditions in SE Oregon are expected. The low becomes cut off on Tuesday, as the earliest models show the cold front move through. There is still some uncertainty, inherent to cut off lows, that shows the cold front moving through Wednesday. When it passes, it will cool temps down to normal, low 60s for the afternoon high in lower elevations, low 50s for mountain valleys. The cloud cover, and increasing chance of precipitation Tuesday evening through Thursday evening could help to moderate temperatures further.
AVIATION /18Z Thursday through Friday/
Issued 1116 AM MDT THU OCT 15 2026 VFR. Areas of smoke from prescribed burning near KBNO and KMYL. Fog possible again tonight in Eastern Oregon. Surface winds: E-SE 5-10kt in the afternoon. Winds aloft at 10kft MSL: E-NE 5-10 kt.
KBOI...VFR. Surface winds SE 5-15kt.
Weekend Outlook...VFR with mostly clear skies on Sat/Sun. Areas of smoke from prescribed burns. Surface winds: E-SE 5-15 kt with gusts 20-25 kt mainly east of KBOI on Saturday, then S-SE 5-10 kt Sunday
BOI WATCHES/WARNINGS/ADVISORIES
ID...None.
OR...None.
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