textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Gradually hotter and drier through Wednesday. Only slight cooling but still dry Thursday.

- Slight chance of afternoon thunderstorms Tuesday and Wednesday south of the ID/NV border, but outflow winds may reach southern Owyhee and Twin Falls Counties.

- Major change beginning Friday with arrival of a cold front and showers, followed by gusty winds, more showers and chance of thunderstorms through Sunday. Snow possible as low as 6500 to 7000 feet MSL Saturday night and Sunday.

SHORT TERM /Through Wednesday Night/

Issued 211 PM MDT MON JUN 22 2026 Generally clear and gradually hotter through Wednesday as a low-amplitude Pacific upper ridge comes inland. Slight chance of afternoon thunderstorms Tuesday and Wednesday south of the ID/NV border, but outflow winds may reach southern Owyhee and Twin Falls Counties. Light east winds Tuesday, then light to moderate west or northwest winds Wednesday.

LONG TERM /Thursday through Monday/

Issued 211 PM MDT MON JUN 22 2026 Warm and dry conditions will continue on Thursday. A shortwave trough will dig across our area early Thursday. This pattern will steer some subtropical moisture into the region, bringing scattered showers/thunderstorms over the central ID mountains and near the NV border Thursday afternoon/evening. Guidance confidence remains strong on a strong upper low digging into the region from the Gulf of Alaska Friday through the weekend. This system has potential to bring significant precipitation Friday and over the weekend. A cold frontal passage is expected on Friday, bringing widespread showers/thunderstorms in the afternoon/evening. Saturday and Sunday will mainly see showers/ thunderstorms over higher terrain on the ID side. Overall, there remains uncertainty over the exact track of this approaching low, but the weekend through Monday will have good potential for wetting rains and temperatures cooling down to 10 to 20 degrees below normal. Snow is possible above 6500 feet MSL north and 7000 feet MSL south Saturday night and Sunday morning.

AVIATION /00Z Tuesday through Wednesday/

Issued 528 PM MDT MON JUN 22 2026

VFR. Increasing mid clouds Tuesday, along with high density altitude during the hot afternoon temperatures. Surface winds: N-NW 5-15 kt through this evening, with areas of gusts to 20-25 kt. Winds aloft at 10kft MSL: W-NW 10-20 kt, then S-W 5-15 kt by early Tue morning.

KBOI...VFR and patchy smoke. Increasing mid clouds Tuesday, along with high density altitude during the hot afternoon temperatures. Surface winds: NW-N 8-14 kt with gusts around 20 kt through the evening, lowering to 5-10 kt around sunset. Then light and variable overnight.

BOI WATCHES/WARNINGS/ADVISORIES

ID...OR...None.