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 showers and isolated thunderstorms today and tomorrow in mountains and near the Nevada border.

- Gradual warming through Saturday.

- 20% chance of afternoon thunderstorms early next week.

SHORT TERM /Through Friday Night/

Issued 332 AM MDT WED APR 29 2026 A cool upper level trough continues to bring unsettled conditions to the area. Showers will develop this afternoon across high terrain and near the Nevada border. A few showers could develop into weak thunderstorms, but may still produce small hail and locally gusty winds. Thursday is largely the same story, with showers and storms relegated almost entirely to central and southern Idaho. Temperatures will continue their steady climb, reaching the low 70s in the lower valleys by Thursday afternoon.

LONG TERM /Saturday through Wednesday/

Issued 332 AM MDT WED APR 29 2026 The warming trend peaks Saturday at 10 degrees above normal, with lower elevations seeing afternoon highs right around 80 degrees. Temperatures hold steady at this mark through the long term forecast. This weekend, a trough amplifies into a cut off low and holds itself off the West Coast this weekend. There is still a 10% chance for precipitation in Southeast and East Oregon over the weekend, but model runs have held firm on a drier solution at this time due to the low being too far west. As the low moves inland, Sunday presents a slightly better chance of precipitation before the more significant chance Monday and Tuesday. 6 hour precipitation chances increase to 20-30% Monday and Tuesday, with a showery precipitation mode. In the afternoon, the chance of thunder increases to near 20%. Thunderstorms will produce heavy rainfall and strong wind gusts.

AVIATION /12Z Wednesday through Thursday/

Issued 513 AM MDT WED APR 29 2026 VFR and overcast this morning. This afternoon, scattered showers will develop over highlands and mountains. There is a 10% chance of lightning in these areas, and any thunderstorms could produce locally gusty winds and small hail. Precipitation tapers off this evening. Snow levels 6000-7000 ft MSL. Surface winds: light and variable under 10 kt, becoming W-NW 5-15 kt this afternoon. Winds aloft at 10kft MSL: W up to 10 kt.

KBOI...VFR. Surface winds: light SE winds this morning, becoming NW 7-12 kt this afternoon.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.

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