Areas of Extreme Heat and Fire Weather in the Pacific Northwest; Heavy Rain in the West and South-central US

Extreme heat will continue across the Pacific Northwest into midweek before finally waning. Hot temperatures, dry, gusty conditions, and isolated dry thunderstorms will bring critical fire weather. Heavy rain and thunderstorms are expected across portions of the Southwest, the Sierras, and the central/southern Plains. A series of storms will bring heavy rain and strong winds to southern Alaska. Read More >

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Last Map Update: Mon, Aug 25, 2025 at 10:24:17 pm MDT

Watches, Warnings & Advisories

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National Weather Service Great Falls, MT

Extreme Heat Warning

Flash Flood Watch

Heat Advisory

Air Quality Alert

Hazardous Weather Outlook

Hydrologic Outlook

Slow-Moving, Localized Heavy Rainfall

Thunderstorms Early/Mid-Week

Heat Continues

The greatest threat from thunderstorm chances during the middle of the week is the potential to produce locally heavy downpours and excessive rainfall. Risks for flash-flooding will be most concerning over burn scars, low-lying urban areas, and small creeks & streams. Chances exist Tuesday through Friday but are greatest on Wednesday and Thursday: August 27-28.

Changes arrive this week as showers and thunderstorms will gradually spread northward each day. First across southwest Montana and Idaho/Lemhi counties in Idaho Monday afternoon, reaching much of the Northern Rockies by late Wednesday and continuing on Thursday. The main threats with these storms will be brief heavy rain, gusty winds, and lightning. There is concern for flash flooding causing localized debris flow in burn scars and flood prone areas by mid week. Take caution if recreating outside!

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Areas of Extreme Heat and Fire Weather in the Pacific Northwest; Heavy Rain in the West and South-central US

NWS Forecast Office Missoula, MT