textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Scattered showers and isolated thunderstorms today over the higher terrain with gusts to 45 mph possible.

- Cooler, breezy, and drier this weekend, except showers persisting over the central Idaho mountains.

- Temperatures warming to around 10 degrees above normal by the middle of next week.

SHORT TERM /Through Monday Night/

Issued 209 PM MDT FRI MAY 29 2026 Much less convectively active than yesterday, with today cooler and lacking the strong short wave trough and vertical shear that arrived at max heating time yesterday. Even so, enough moisture and instability remain for showers and weaker thunderstorms in eastern OR and in the mountains of western ID until sunset. Strongest storms will have wind gusts to 40 mph, not nearly as strong as yesterday, and at most only small hail. Winds will remain breezy this afternoon and through the night as well, generally from the west or northwest 10 to 15 mph, except 15-30 mph in the Snake Basin. Speeds will be lighter in the mornings, then gusty again in the afternoons both Saturday and Sunday, gusts as strong as 40 mph in the Snake Basin southeast of Boise. The main upper low will weaken this afternoon and tonight moving eastward across NV and UT, then northeastward into WY Saturday. It will remain close enough for scattered showers and isolated afternoon/evening thunderstorms in our eastern-most CWA mountains through Sunday. Temps will be cooler through Saturday night, then warming again starting Sunday. Highs will be in the mid 60s to mid 70s with lows in the 30s in the mountains through 40s in the valleys.

LONG TERM /Tuesday through Saturday/

Issued 209 PM MDT FRI MAY 29 2026 A ridge of high pressure aloft will build into the northwest region by Monday, bringing a warming and drying trend through midweek. Temperatures are expected to climb 10 degrees above normal by Wednesday. Winds will be light early in the week with dry conditions. A weak shortwave trough to our north may clip our area late Wednesday and Thursday, resulting in a 10-20% chance of showers and thunderstorms across northern areas. Breezy northwest winds will be expected during those days as this system passes by. By Friday, a large Pacific trough will keep the area under southwest flow aloft, driving temperatures 15-20 degrees above normal toward the end of the extended forecast period.

AVIATION /06Z Saturday through Sunday/

Issued 1232 AM MDT SAT MAY 30 2026 VFR. Isolated showers overnight near KBKE and over the ID-NV border tapering off by early morning. Isolated terrain driven showers over the West Central Mountains tomorrow afternoon. Surface winds: W-NW 5-15 kt becoming W-NW 10-15 kt with gusts to 30 kt in the Magic Valley. Winds aloft at 10kft MSL: W-NW 10-20 kt.

KBOI...VFR. Surface winds: W-NW 8-13 kt overnight, then NW 10-15 kt with gusts to 25 kt by mid morning.

Sunday Outlook...Generally VFR. MVFR ceilings in the early AM near KBNO/KMYL with mountain obscuration in low clouds. Surface winds: W-NW 5-15 kt with afternoon gusts to 20-25 kt, except W-NW 10-20 kt with afternoon gusts to 30-40 kt in the Snake Plain east of KBOI.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.