San Francisco, CA Warnings, Watches and Advisories

Do not drive vehicles through flooded areas. The water depth or fast flowing water/mud/debris from a flash flood will make road conditions unsafe. Do not rely soley on data presented here or other third-party websites - always check your official national and local weather service agency website, socials, radio and/or TV stations for making critical decisions related to weather events.

Please carefully read each posted Warning and Alert as it relates to the area(s) being affected. We may provide a wider range of issued severe weather warnings for surrounding cities and counties, so some alerts may not directly impact this location. This is done to help with preparing for severe weather that may overlap or be heading towards San Francisco.

Use the Radar Maps link provided to understand the trajectory of a storm.

Dense Fog Advisory issued January 18 at 8:34PM PST until January 19 at 12:00PM PST by NWS Sacramento CA

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Carquinez Strait and Delta, Central and Southern Sacramento Valley, and Northern San Joaquin Valley. * WHEN...Until noon PST Monday. * IMPACTS...Low visibility could make driving conditions hazardous.

Dense Fog Advisory issued January 18 at 7:47PM PST until January 19 at 12:00PM PST by NWS Hanford CA

* WHAT...Visibilities likely less than 200 feet to near zero in dense fog. * WHERE...A portion of central California. * WHEN...Until noon PST Monday. * IMPACTS...Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Visibility will improve at most locations by Monday afternoon. However, dense fog returns early in the evening.

Beach Hazards Statement issued January 18 at 3:01PM PST until January 20 at 8:00PM PST by NWS Eureka CA

* WHAT...Increased threat of sneaker waves expected. * WHERE...Mendocino Coast County. * WHEN...From Tuesday morning through Tuesday evening. . * IMPACTS...Large, unexpected waves can sweep across the beach without warning, sweeping people into the sea from rocks, jetties, and beaches. These sneaker waves can also move large objects such as logs, crushing anyone caught underneath.

Beach Hazards Statement issued January 18 at 3:01PM PST until January 20 at 8:00PM PST by NWS Eureka CA

* WHAT...Increased threat of sneaker waves expected. * WHERE...Coastal Del Norte, Northern Humboldt Coast and Southwestern Humboldt Counties. * WHEN...From late Monday night through Tuesday evening. . * IMPACTS...Large, unexpected waves can sweep across the beach without warning, sweeping people into the sea from rocks, jetties, and beaches. These sneaker waves can also move large objects such as logs, crushing anyone caught underneath.