textproduct: Boise

KEY MESSAGES

- Temperatures will remain above normal through Tuesday.

- A slight chance of showers and thunderstorms will develop this afternoon and evening across east-central Oregon and west- central Idaho.

- A dry cold front on Tuesday will bring breezy winds, with temperatures cooling 5-10 degrees by Wednesday.

- A wetter pattern will develop late in the week into the weekend.

SHORT TERM /Through Wednesday Night/

High pressure will keep conditions mostly dry with above normal temperatures through Tuesday. High temperatures will be 10-15 degrees above normal, reaching the low to mid 70s at lower elevations. A weak system will move through late today across northern areas, bringing a 20% chance of showers and thunderstorms this afternoon and evening to mainly the higher terrain across east-central Oregon and west-central Idaho. A few showers will linger across central Idaho overnight before exiting. On Tuesday, an upper trough will move east across southern Canada, increasing winds across our area. Wind gusts of 20-35 mph will develop in the afternoon and evening as a dry cold front moves through, with stronger gusts on ridgelines. Weak instability will support a 20% chance of showers and thunderstorms along the Idaho/Nevada border in the afternoon. High temperatures across the north will be slightly cooler on Tuesday with 5-10 degrees of cooling in all areas by Wednesday. Winds will begin to subside on Wednesday, but will remain breezy in the afternoon with gusts 15-25 mph. Moisture ahead of an upper low off the California coast will bring a 20% chance of showers to the Oregon/Nevada border late in the day.

LONG TERM /Thursday through Monday/

A more active pattern will develop during the extended period. An upper low will slowly approach the coast of California through Friday. Shower chances will gradually increase as the low moves east, reaching 20-40% along the Nevada border on Thursday and 20-50% in all areas (highest in the south) on Friday. Southerly flow ahead of the low will bring another warming trend, with lower valleys reaching the lower 70s by Friday. Weak daytime instability will also support a 5-15% chance of thunderstorms.

Ensembles are in better agreement that the low will move inland to our south over the weekend while a colder trough from the Gulf of Alaska moves into the Pacific Northwest. Temperatures should remain mild on Saturday, then cool several degrees each day Sunday and Monday as the colder trough moves inland. Precipitation chances will rise to 30-60% in all areas with a 5-15% chance of thunderstorms each day as the colder trough interacts with deeper moisture advected north by the California low. Precipitation amounts are expected to be light to moderate under this pattern. Snow levels initially will be above 8kft MSL, but will fall to 6-8kft by Sunday and 4500-6500 feet on Monday, allowing for light snow accumulations on higher peaks. Winds will be breezy each afternoon under this pattern.

AVIATION /06Z Monday through Tuesday/

Issued 1210 AM MDT MON APR 6 2026

VFR and high clouds. Isolated showers/thunderstorms in northeast OR and W-central ID developing late afternoon, with 20-30 kt outflow wind gusts. Surface winds: variable 10 kt or less, then SW-NW 5-15 kt in the afternoon. Winds aloft at 10kft MSL: SW to W 5-15 kt.

KBOI...VFR and high clouds. Surface winds: SE 4-10 kt, shifting to NW 4-10 kt around Mon/18Z.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.