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.
KEY MESSAGES
- Not as cool, but still areas of frost Sunday and Monday mornings.
- Cool and unsettled into early next week with afternoon showers over the mountains.
- Temperatures below normal through Monday then warm to above normal by Thursday.
SHORT TERM /Through Monday Night/
A cool upper level trough will remain over the area over the short term and weaken. Scattered showers will form over the mountains each afternoon with the high sun angles and cold air aloft. Each day temperatures will moderate a few degrees.
LONG TERM /Tuesday through Saturday/
The upper-level trough that was largely stationary through the short term will finally move east Tuesday morning, giving way to north/northwesterly flow aloft ahead of an upper-level ridge building in. A majority of numerical models have the ridge axis moving overhead by Thursday afternoon. Once getting into late afternoon Friday/Saturday time frame, most models try to bring a 500 mb closed low into the Pacific NW, with west/southwest flow aloft and precipitation chances returning. Overall, temperatures are expected to warm to near-normal by Wednesday, then 5-10 degrees above normal Thursday through Saturday. A 20-50% chance of showers in the mountains and 10-20% chance in the valleys on Tuesday will trend lower on Wednesday. By late week, only a 10-20% chance of showers will remain over the mountains. Winds will be mostly light through the period with a few afternoon breezes.
AVIATION /18Z Saturday through Sunday/
Issued 1208 PM MDT SAT APR 25 2026
Mainly VFR under mid to high clouds. Isolated mountain snow showers in the afternoon near KMYL and KBKE, with localized MVFR/IFR conditions and mountain obscuration in showers. Scattered showers near the NV border. Snow levels 4-6kft MSL. A 5-10% chance of thunderstorms along the NV border. Surface winds: variable less than 10 kt until early afternoon, then W-N 5-10 kt. Winds aloft at 10kft MSL: SW-W 5-15 kt.
KBOI...VFR. Surface winds: SE 3-6 kt into early afternoon, then NW 5-10 kt this afternoon into evening.
Sunday Outlook...Mainly VFR. Localized MVFR/IFR conditions and mountain obscuration in scattered showers over higher terrain in the afternoon. A 5-10% chance of thunderstorms near the NV border. Snow levels 4-6kft MSL. Surface winds W-NW 5-15 kt, with gusts to 25 kt in the Western Magic Valley and southeast of KBOI.
BOI WATCHES/WARNINGS/ADVISORIES
ID...None.
OR...None.
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