Prolonged Atmospheric River Will Impact the Northwest Early this Week

A weather system in the Pacific Northwest will produce rain throughout the day, before a potent atmospheric river produces a prolonged round of heavy rainfall, widespread urban and river flooding, and high elevation snow to the region Monday through Wednesday. Showers and thunderstorms may produce isolated damaging winds, a brief tornado, and locally heavy rainfall across parts of Florida today. Read More >

Click a location below for detailed forecast.

Last Map Update: Wed, Dec 10, 2025 at 6:08:15 am PST

Watches, Warnings & Advisories

National Weather Service San Francisco Bay Area, CA

Zoom Out

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.