National Weather Service United States Department of Commerce

Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

⚠️ WINTER TRAVEL ALERT ⚠️ A significant weather transition will be moving through the Northern Rockies from Noon Friday (Dec 26) through Saturday morning (Dec 27). This system will impact both western Montana and north central Idaho. Expect a rapid transition from wet roads to snow and ice. Bursts of heavy snow may briefly lower visibility to near zero, especially for travelers in the following areas: Idaho: Hwy 95 (Grangeville/White Bird), Hwy 12 (Orofino to Lolo Pass), Elk City, Dixie. Montana: I-90 (Lookout Pass to Butte), Highway 93 (Eureka to Lost Trail Pass), and Highway 2 (Troy to Marias Pass). Including: Missoula, Kalispell, Libby, Seeley Lake. Mountain Passes: Lookout, Lolo, Lost Trail, Marias, and White Bird Hill will likely see the most difficult driving conditions with periods of heavy snow. 🏔️❄️ Additionally, a passing cold front will bring wind gusts of 30 to 45 mph. If you are in an area still recovering from recent wind damage, please stay alert as these gusts could cause further issues. 🌬️ ✅ Check conditions before you head out. ✅ Slow down on slick surfaces. ✅ Stay safe!
A cold front is expected on Friday causing widespread snow and gusty west winds. Snow showers and potentially snow squalls linger into Saturday with breezy conditions. Falling temperatures may create very icy conditions, especially across northwest Montana. Dry conditions are expected on Sunday into Monday, though freezing fog will be possible.

 

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