Prolonged Atmospheric River in the Pacific Northwest; Snow and High Winds from the Upper Midwest into the Northeast

A prolonged atmospheric river will continue to impact the Pacific Northwest into the Northern Rockies with heavy rainfall, areas of urban and river flooding, landslides, heavy mountain snow, and gusty winds into Thursday. A strong clipper system will bring the threat of heavy snow and high winds across the Upper Midwest/Great Lakes as well as portions of the interior Northeast and Appalachians. Read More >

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Last Map Update: Tue, Dec 9, 2025 at 5:10:30 pm PST

Watches, Warnings & Advisories

National Weather Service San Francisco Bay Area, CA

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National Weather Service Los Angeles, CA

Dense Fog Advisory

Small Craft Advisory

Beach Hazards Statement

Dense Fog Advisory for the Foothill Region.

Dense Fog - High Transportation Risk

Warming Trend outside of the San Joaquin Valley

Warming Temperatures across the Higher Elevations

A Dense Fog Advisory is in effect through 11 AM Wednesday, December 10 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 Wednesday morning.

Largely in part to the low level clouds, much of the San Joaquin Valley has failed to exceed 65 degrees for the past two weeks. High pressure building over the region this week will bring a moderate probability for a return to these temperatures. Probabilities are greater at higher elevations out of the cloud deck.

Lingering low clouds across the San Joaquin Valley have kept the area cold with minimal change during the day. On the contrary, the Foothill & higher elevations of the Sierra Nevada, the Coastal Range and the Kern County Mountains will see considerable warming by this weekend. In the image of the range of temperatures, the San Joaquin Valley is more likely to see the lower values. However, the elevations above the clouds will likely see the upper values in the range of temperatures.