Marine Weather and Tide Forecast for Somers, MT

FXUS65 KMSO 220742 AFDMSO

Area Forecast Discussion National Weather Service Missoula MT 142 AM MDT Wed Jul 22 2026

DISCUSSION

KEY MESSAGES:

- Monsoon moisture drives thunderstorms through Thursday, bring a localized flash flood threat.

- Hot, dry, and breezy conditions this weekend will be a concern for critical fire weather conditions.

- Smoke from the Pacific Northwest wildfires will continue to impact air quality, potentially worsening over the weekend.

The Southwest Monsoon continues to build a ridge of high pressure over the western U.S. while drawing in abundant moisture. Today and Thursday, that moisture will work its way into southern Idaho, all of Lemhi County in Idaho, and southwest Montana. The result will be widespread showers and thunderstorms in these regions. The abundant moisture and slow-moving nature of these storms make heavy rain and localized flash flooding the primary risks.

Late Thursday and into the weekend, a broad area of low pressure over the northeast Pacific Ocean pushes the high-pressure ridge further east, bringing in much drier air. This low-pressure system will also bring stronger winds aloft over the Northern Rockies, which will in turn produce gusty westerly winds over western Montana and north-central Idaho on Friday and Saturday. Currently, Saturday looks like the windier day, with widespread gusts between 15 to 30 mph. There is a 20 to 30 percent probability gusts will reach 40 mph in the terrain and valleys of western Montana Saturday afternoon and evening. These winds, along with expected relative humidity values in the upper single digits and low teens, will present a major concern for critical fire weather conditions.

Another potential problem with the westerly winds will be widespread smoke from several wildfires currently burning in Washington and Oregon.
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