textproduct: Boise

This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Afternoon rain and snow showers over higher terrain through Wednesday.

- Gradual warming through the week.

- Thunderstorms possible this weekend.

SHORT TERM /Through Thursday Night/

Issued 441 AM MDT TUE APR 28 2026 A cool upper level trough will keep unsettled conditions today and tomorrow afternoon. Showers and a low chance (10%) of thunder over mountains will be the most notable part of the fairly weak system. Accumulations will be minimal out of storms. Temperatures gradually climb each day, up to 5 degrees above normal by Thursday.

LONG TERM /Friday through Tuesday/

Issued 441 AM MDT TUE APR 28 2026 Brief ridging Friday as the warming trend continues. Temperatures hold steady at 10 degrees above normal Saturday through the long term forecast. The forecast gets a little more uncertain beginning this weekend. A shortwave upstream amplifies into a closed low off the Pacific Northwest coast. Models show the low tracking south along the coast on Saturday. Clouds increase, but most of the precipitation associated at this stage remains west and north of our area. Closed lows are notorious for their unpredictability by NWP, so there is room for precipitation chances to rise on Saturday if the predicted track changes. Sunday through Tuesday model deviations continue to increase. However, the broad consensus is that the closed low will bring unsettled conditions, especially in the afternoon. A majority of models show afternoon and evening showers popping up Saturday through the long term. At peak heating and with the colder atmosphere brought by the low, thunderstorm development will be possible. Chance of precipitation rises from 10-20% this weekend to 20-30% early next week.

AVIATION /18Z Tuesday through Wednesday/

Issued 1128 AM MDT TUE APR 28 2026 VFR with mid-high clouds. Scattered mountain showers this afternoon in Central Idaho. Snow levels 6000-7000 ft MSL. Surface winds: W-NW 5-15 kt this afternoon with gusts in the Snake Plain up to 20 kt. Otherwise, light and variable. Winds aloft at 10kft MSL: NW 5-15 kt.

KBOI...VFR. Surface winds: NW 5-15 kt this afternoon. Becoming southeast around 5 kt this evening into early Wed morning.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.

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