National Weather Service United States Department of Commerce

Storm Impacting the Southwest U.S.; Above Normal Temperatures Further East

A storm system will shift across the southwest U.S. through Thursday with widespread showers and isolated thunderstorms. Isolated flooding is possible. High-elevation snow is also expected in parts of Nevada and the southern Sierra Nevada range. East of this storm, above average temperatures will challenge or break daily record high temperatures this week in the southern Plains and southeast U.S. Read More >

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Last Map Update: Tue, Nov 18, 2025 at 7:44:24 am MST

🌫️ MORNING FOG LIKELY TUESDAY-FRIDAY 🌫️ We're monitoring a pattern that favors the development of morning fog, which could be dense at times, from Tuesday through Friday. WHEN: Tuesday, Wednesday, Thursday, and Friday mornings. WHERE: Many valleys across western Montana and north-central Idaho. This includes, but is not limited to, the Flathead, Missoula, and Bitterroot valleys, and the Camas Prairie. IMPACTS: Significantly reduced visibility is possible during the morning commute. Conditions can change rapidly over short distances. If you encounter dense fog while driving: 🚗 Reduce your speed 💡 Use low-beam headlights (high-beams reflect off the fog) 📏 Increase your following distance
🦃 Planning on traveling for Thanksgiving? We are closely monitoring a storm system that has the potential to bring the first significant lower elevation snow and much colder temperatures to western Montana and north-central Idaho during the busy holiday travel period. This is an early outlook, and uncertainty is still high regarding the exact timing, strength, and track of this storm. This will be key in determining precipitation amounts and specific impacts. Potential Impacts: Slippery and snow-covered roads, especially over mountain passes like Lookout, Lolo, Lost Trail, Marias, and Homestake. Difficult travel could also extend to valley floors and major corridors, including I-90, I-15, US-93, and US-95. What You Can Do Now: Keep a close eye on the forecast as we get closer to the holiday. Consider having a backup travel plan. Now is a great time to winterize your vehicle and stock it with an emergency supply kit.

 

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