textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Warm and dry Saturday, turning hotter Sunday as lower elevations could see first 90 degree day of the year.

- Heat peaks on Tuesday with temperatures 15-25 degrees above normal. Lower elevations will reach the low-mid 90s.

- Not as hot with a slight chance of precipitation in the mountains starting Wednesday.

SHORT TERM /Through Sunday Night/

Issued 158 PM MDT FRI MAY 8 2026 Seeing some bands of mostly high clouds ahead of an upper trough moving into the Pac NW this afternoon. Dry conditions will accompany the trough and a surface front as it crosses the region tonight. The front will push through SE Oregon this evening, bringing wind gusts to 35 mph in the typically windier spots of northern Malheur and Baker counties. The front and winds will work through the lower-middle Snake Plain overnight, keeping it breezy as winds gust to 30 mph. Saturday will be the coolest day for most sites as the shortwave trough moves east and an upper ridge amplifies over central OR/WA. The warm air mass under the building ridge will shift into our region on Sunday, bringing an abrupt warmup. As winds become easterly, high temperatures on Sunday will push to 15-20 degrees above normal. This will put lower elevation sites near 90 and mountain valleys into the upper 70s.

LONG TERM /Monday through Friday/

Issued 158 PM MDT FRI MAY 8 2026 Near record temperatures are anticipated this coming week, as high pressure builds in over the western United States. The warmest day of the week (and so far this year) looks to come Tuesday, with temperatures pushing 25 degrees above normal. It is worth mentioning that water temperatures will still be running cold, so consider taking extra precautions if participating in water recreation.

The pattern becomes less certain in it's progression after Wednesday. The bulk of the uncertainty lies in the progression of an upper-level trough, and whether or not it closes off into a low off the coast of California, or stays in the flow aloft and crosses our area. In either case, a southerly push of moisture will lead to slight chances of precipitation and perhaps even some thunder over higher terrain come Wednesday/Thursday. Temperatures will begin to trend cooler beyond Tuesday, becoming more seasonable by Friday.

AVIATION /00Z Saturday through Sunday/

Issued 607 PM MDT FRI MAY 8 2026 VFR under passing high clouds. Surface winds: W-NW 10-20 kt with gusts to 20-30 kt, strongest near KTWF/KJER, becoming W-NW 5-10 kt overnight, except W-SW 10-15 kt with gusts to 20-25 kt near KTWF/KJER. Winds aloft at 10kft MSL: W-NW 15-30 kt.

KBOI...VFR. Surface winds: NW 6-12 kt.

Sunday Outlook...VFR. Surface winds SW-SE 10-20 kt. A cold front Sunday night will return NW gusts of 15-30 kt.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.