textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- A pair of weak systems will bring light rain showers to the area, one today north of a line from Baker City to McCall, and another generally north of Boise Monday night.

- Above normal temperatures continue through the week. Record highs are possible, especially mid week.

- A cooler, wetter pattern is likely to develop next weekend or early the following week.

- Breezy at times through the week.

SHORT TERM /Through Tuesday Night/

Issued 305 AM MST SUN NOV 8 2026 A trough will move across Washington today while a ridge of high pressure remains anchored across the Southwest and extends across the Plains. The trough will bring isolated showers to northeast Oregon and west-central Idaho today, generally north of a Baker City OR to McCall ID line, while the ridge keeps conditions dry elsewhere. Similarly, temperatures across the north will be a few degrees cooler while across the south highs will be similar to Saturday, around 10 degrees above normal. However, the system will bring mostly cloudy skies and breezy winds to all areas. Winds will be strongest this morning from the southeast with gusts 15-25 mph, gradually subsiding this afternoon.

The ridge will remain in place through Tuesday, but another system moving through the Pacific Northwest will clip the area Monday night. This will once again bring a chance of showers to the north while southern areas only see high clouds. This system will be slightly deeper than the system today, resulting in a 20-50% chance of showers generally north of Boise, except a 50-80% chance across the west-central Idaho mountains. Snow levels will remain above 7000 feet limiting light snow accumulation to the peaks, with light rain amounts at lower elevations. Conditions will dry out Tuesday with decreasing clouds. Winds will become a bit breezy ahead of this system on Monday, then decrease on Tuesday as the system moves east. Highs will remain 10-15 degrees above normal Monday and Tuesday.

LONG TERM /Wednesday through Sunday/

Issued 305 AM MST SUN NOV 8 2026 An upper level ridge centered to our east will amplify through late week. The building ridge and increased southerly flow will increase temperatures a few more degrees. This will place max temperatures near daily record highs, and lower valleys are forecast to reach the mid to upper 60s and may approach 70F. A deep upper level trough approaching the coast will split mid week, with the southern portion closing off and diving south to southern California. The northern portion is favored to remain off the coast initially, continuing mild and dry conditions. However, some global ensemble members bring it inland enough for a 10-30% chance of showers, with the highest chance across the north and the mountains. Confidence is higher that the trough will progress inland by Sunday or early next week, bringing the potential for widespread precipitation and cooler temperatures. The amplified pattern will bring breezy south to southeasterly winds mid week, increasing late week into the weekend as the trough approaches.

AVIATION /18Z Sunday through Monday/

Issued 1056 AM MST SUN NOV 8 2026

VFR. Mid to high clouds as a weak front moves across the north. Isolated afternoon showers north of a KBKE-KMYL line. Patchy valley fog in the Western Magic Valley and in the Harney Basin early tomorrow morning, mixing out by late morning. Surface winds: SE to SW 5-15 kt, becoming variable less than 10 kt by late afternoon. Winds aloft at 10kft MSL: SW 15-30 kt.

KBOI...VFR. Surface winds: SE 6-12 kt, becoming variable less than 8 kt this afternoon.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.