National Weather Service

Watches, Warnings & Advisories
NWS Homepage

One product issued by NWS for:
Share |

Beach Hazards Statement

Coastal Hazard Message
National Weather Service San Francisco CA
929 AM PST Mon Nov 30 2020

...Enhanced Risk of Sneaker waves and rip currents for west and
northwest facing beaches Late Monday Morning into Tuesday...

.A long period northwest swell arrives this morning and will
impact the coastline through late Tuesday morning before
subsiding. Initial swell heights of 7 to 9 feet at 19 seconds will
increase the risk of sneaker waves today. Swell heights will
build to 9 to 11 feet at 17 seconds to 18 seconds tonight and
early Tuesday morning before subsiding late Tuesday morning. A
much longer period swell train arrives Wednesday and result in a
much greater risk of these hazards.

San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
San Francisco Peninsula Coast-
Southern Monterey Bay and Big Sur Coast-
929 AM PST Mon Nov 30 2020


* HAZARDS...Increased risk of sneaker waves and rip currents,
  especially along the west and northwest facing beaches.
  Additionally, breaking waves initially from 7 to 10 feet at 19
  seconds today, then breaks from 10 to 13 feet at 17 seconds to
  18 seconds tonight and early Tuesday morning.

* TIMING...10 AM PST today to 10 AM Tuesday.

* LOCATION...Coastal Sonoma County to coastal Monterey County, in
  particular west to northwest facing beaches. Excludes the
  Northern Monterey Bay beaches due to their southerly

* ADDITIONAL DETAILS...A much longer period northwest swell will
  arrive Wednesday and continue through Thursday and result in a
  much greater risk for sneaker waves and rip currents.

* POTENTIAL IMPACTS...Increased risk of ocean drowning. Sneaker
  waves often catch people off guard and knock them into the
  ocean. Rip currents can pull swimmers and surfers out to sea.
  Large breaking waves can cause injury, wash people off beaches
  and rocks, and capsize small boats near shore. Use extreme
  caution near the surf zone as large waves will be capable of
  sweeping people into the frigid and turbulent ocean water.
  Cold water shock may cause cardiac arrest, and it also can
  cause an involuntary gasp reflex causing drowning, even for a
  good swimmer.


Remain out of the water to avoid hazardous swimming conditions.



U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
Page last modified: May 16, 2007
NATIONAL WEATHER SERVICE: for Safety, for Work, for Fun - FOR LIFE