Dangerous Fire Conditions in the Southern High Plains; Severe Weather in the Central Plains and Upper Midwest; Late-Season Mountain Snow

Dry and windy conditions will produce dangerous fire weather conditions across the southern High Plains into the Southwest. Severe storms, including very large hail, strong tornadoes, and winds, are expected in the central Plains into the Upper Midwest. Heavy late-season snow and record cold temperatures are expected in the northern to central Rockies. Heat is spreading across the eastern U.S.. Read More >

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Last Map Update: Sun, May 17, 2026 at 7:56:30 am MDT

Watches, Warnings & Advisories

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National Weather Service Great Falls, MT

Freeze Warning

Winter Weather Advisory

Wind Advisory

Frost Advisory

Widespread Valley Frost Sunday Through Tuesday

Mountain Snow Returns This Weekend

🌱 Gardeners and growers, it's time to prep! A widespread valley frost is on the way for Western Montana and North Central Idaho. Expect morning lows to dip into the mid-20s and low-30s from Sunday through Tuesday (May 17-19). Now is the time to plan ahead: cover sensitive vegetation, bring those vulnerable potted plants inside, and make sure outdoor animals have warm shelter and unfrozen water. 🥶

🏔️ Heading into the backcountry this weekend? Winter isn't quite done with the high terrain. We are tracking a system that will bring accumulating snow above 4,000 feet across western Montana and north-central Idaho this Saturday and Sunday. ⚠️ The biggest concern isn't just the snow—it's the cold, wet, and breezy conditions creating a high risk for hypothermia for anyone recreating outdoors. Backcountry roads will also become slushy and slick. Plan accordingly, pack extra layers, and be prepared for winter-like conditions in the mountains!