San Francisco Severe Watches & Warnings NOAA Weather Radio

High Surf Advisory, Coastal Flood Advisory
Statement as of 2:46 PM PST on December 20, 2014

...High surf advisory now in effect until 10 PM PST this evening... ...Coastal Flood Advisory now in effect from 9 am Sunday to 3 PM PST Tuesday...

* timing...generally speaking...extreme high tides are expected to occur during the mid to late morning hours of December 21st...22nd and 23rd. Extreme low tide will occur during the late afternoon to late evening hours. The exact timing of tides is location dependent so please visit tidesandcurrents.NOAA.Gov/ports/...for more specific tidal information.

* Waves and surf...northwest swell of 14 to 17 feet with a period of 17 seconds will remain a possibility through 10pm. Occasional breakers of 24 feet also will be possible.

* Locations...low lying areas along the immediate coast and Bay front including parking lots...coastal trails...sidewalks...marshes...underpasses and roadways.

* Impacts...sea water on roadways...parking lots...trails and sidewalks. People visiting beaches may lose entry and exit to coves and narrow beaches.

Precautionary/preparedness actions...

It is extremely dangerous to fish or observe waves from exposed coastal structures or rocks during high surf conditions. Very large waves can suddenly sweep across previously dry areas. Swimming or surfing in these waves may be dangerous for anyone.

A high surf advisory means that high surf will affect beaches in the advisory area...producing rip currents and localized beach erosion.

A coastal Flood Advisory indicates that onshore winds and tides will combine to generate flooding of low areas along the shore.

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