textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Dry with temperatures 10 to 20 degrees above normal through next week.

- Today and Monday are expected to be the warmest days with record or near record highs.

- A minor disturbance on Monday will bring a low chance of showers and thunderstorms with gusty outflow winds along the Idaho/Nevada border.

- Cooler with a chance of showers starting next weekend.

SHORT TERM /Through Tuesday Night/

Issued 349 AM MDT SUN OCT 4 2026 An upper level ridge will bring very warm temperatures to the area through the period. Today is expected to be the warmest day across most of southwest Idaho, but Monday will be slightly warmer in parts of southeast Oregon. Highs will reach the 80s to around 90 in the lower elevations, around 15 to 20 degrees above normal. These values will approach or exceed daily records today and Monday. See the latest Public Information Statement for details. Temperatures on Tuesday will only be a degree or two cooler at most and will also approach record highs in some locations.

A weak shortwave trough will move across northern Nevada late Monday. High clouds will increase tonight ahead of this feature, and a 5-15% chance of showers and thunderstorms will develop along the Idaho/Nevada border Monday afternoon and evening. Dry air will create the potential for gusty outflow winds up to 40 mph from any storms. Otherwise, conditions will remain dry through the short term. Areas of smoke will be seen near prescribed burns, mainly in the mountains. Expect mostly light winds outside of showers/storms.

LONG TERM /Wednesday through Sunday/

Issued 349 AM MDT SUN OCT 4 2026 The ridge will remain in place through Thursday with highs 10 to 20 degrees above normal. This will also keep skies mostly clear with light winds. On Friday, an upper level trough will approach the Pacific Northwest, increasing winds over the higher terrain. However, temperatures will remain warm ahead of a cold front. The front will arrive on Saturday, cooling temperatures by about 15 degrees. Confidence on the evolution of the trough decreases by Sunday, but additional cooling is likely as the trough moves overhead. Ensembles indicate that subtropical moisture will lift northeast across the Great Basin during this period and interact with the incoming trough, but favor keeping most of the moisture east of our area. This will result in a 20-40% chance of showers across eastern areas Saturday and Sunday with a 10-20% chance elsewhere. Breezy winds will develop across the area as the trough advances.

AVIATION /12Z Sunday through Monday/

Issued 604 AM MDT SUN OCT 4 2026 VFR. Increasing high clouds tonight. Areas of smoke and haze may reduce visibility near prescribed burns. Surface winds: variable less than 12 kt. Winds aloft at 10kft MSL: SW-W 5-15 kt.

KBOI...VFR. Surface winds variable less than 6 kt through mid afternoon, becoming NW around 5 kt late afternoon through early evening.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.