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Prolonged Atmospheric River in the Northwest; Snow in the North-Central US

A prolonged atmospheric river will bring heavy rainfall which may lead to widespread urban and river flooding, heavy mountain snow, along with gusty winds to the Pacific Northwest into the northern Rockies through much of the week. A clipper will bring a period of snow across the upper Midwest and the Great Lakes into Tuesday, before a stronger system bring more wintry impacts. Read More >

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Last Map Update: Mon, Dec 8, 2025 at 5:10:30 pm PST

A Dense Fog Advisory is in effect through 11 AM Tuesday, December 9 for Foothill region of Central California which includes the elevations from 1,000 feet to 2,500 feet. Mountain roads, which include: 41, 58, 152, 168, 198 will see sudden drops in visibilities from several miles to under a quarter mile.
Dense fog continues across the foothill region of Central California today, with visibilities down to a quarter mile for elevations from 1000 feet to near 2500 feet. A Dense Fog Advisory is in effect until 11 AM PST on Tuesday morning.

 

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