Severe Thunderstorms in the Midwest and Arizona; Heat Continues in the Southeast and Southwest

Thunderstorms, some severe, may lead to scattered instances of flash flooding across the Midwest and Ohio Valley and southern Arizona. The threat will shift to the Mid-Atlantic coast on Thursday. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that little-to-no relief from the scorching daytime highs will be available. Read More >

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Last Map Update: Thu, Aug 20, 2026 at 4:24:48 am MDT

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National Weather Service Great Falls, MT

Heat Advisory

Air Quality Alert

Heat Returns to Western MT & North Central ID

We are tracking a return to hot weather late this week. 🌡️ Heat will build on Thursday, with temperatures peaking on Friday, August 21st. Expect highs in the 90s for western Montana and the low 100s in the lower valleys of north central Idaho. Please note: Overnight relief will be minimal in the NC Idaho lower valleys, with lows only dropping to near 70 degrees. We're also expecting degraded air quality across the region from smoke. Take it easy out there, stay hydrated, and check in on your neighbors!