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

- Breezy and slightly cooler Monday.

- Very hot Tuesday. Record high temperatures in the mid to upper 90s in the lower valleys.

- Cooler beginning Wednesday with a chance of showers and thunderstorms.

SHORT TERM /Through Tuesday Night/

Warm, dry weather today under broad upper ridge. A dry cold front to our northwest will pass through eastern OR this evening and western ID overnight, marked by increasing mid and high clouds and a wind shift to west/northwest. Pre-frontal south or east winds will keep tonight warmer than last night, but Monday should be slightly cooler than today and Monday night cooler than tonight. Post-frontal west/northwest winds will increase to 15 to 25 mph on the Idaho side Monday, with afternoon gusts to 30 mph. The supporting upper level short wave trough will flatten the main ridge Monday, but after it exits to our east the ridge will rebuild to even greater amplitude as it passes over our area on Tuesday. That means record high temperatures Tuesday, but not quite as hot as forecast yesterday.

LONG TERM /Wednesday through Sunday/

An upper trough will approach the region on Wednesday with southerly flow over the area. Subtropical moisture will move northward from Baja on Wednesday, with precipitable water values reaching the 90th percentile. This combined with the trough moving inland will trigger scattered showers and thunderstorms on Wednesday afternoon and evening. Shear values are sufficient too for a severe weather threat with organized strong storms possible. The trough moves inland over southeast OR and southwest ID on Thursday with a continued chance of showers and thunderstorms. Model guidance shows zonal flow or weak troughing over the area Friday through the weekend with generally dry conditions. Temperatures expected to be well above normal again on Wednesday with lower valleys reaching into the 90s. Temperatures will trend down around 10 degrees Thursday, then cool to around season normals by the weekend.

AVIATION /18Z Sunday through Monday/

Issued 1132 AM MDT SUN MAY 10 2026

VFR. Surface winds: SW-SE increasing to 10-20kt this afternoon, becoming NW 10-20kt this evening with gusts up to 30kt near KONO KBKE after sunset. Winds aloft at 10kft MSL: W-SW 20-30kt.

KBOI...VFR. SE winds 10-20kt becoming NW 10kt after sunset.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.

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