507 
WHUS46 KMTR 041004
CFWMTR

Coastal Hazard Message
National Weather Service San Francisco CA
204 AM PST Fri Dec 4 2020

...Long Period Swell will bring Dangerous Sneaker Waves...

Beach Hazard Statement will continue into this afternoon.

Long period swell will continue into this afternoon which will 
maintain the increased risk of sneaker waves and strong rip 
currents. Swell will peak overnight at around 12-14 feet at 17- 18
seconds, and will slowly decline through much of today.

Sneaker waves are waves that seem to come out of nowhere and can
have a periodicity of minutes to tens of minutes. A deceptively
calm ocean typically exists between the sets of sneaker waves.
These consequently may catch those on coastal jetties, rocks,
piers, or shorelines offguard and may injure them or knock them
into the cold, turbulent ocean. Beachcombing is not advised
during this timeframe. In addition, strong rip currents will
accompany the energetic wave train, particularly at WNW facing
beaches. These types of events claim lives each year along our
coast so extreme vigilance is advised if visiting the coast.

CAZ006-505-509-530-041815-
/O.CON.KMTR.BH.S.0012.000000T0000Z-201204T2300Z/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
San Francisco Peninsula Coast-
Southern Monterey Bay and Big Sur Coast-
204 AM PST Fri Dec 4 2020

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH THIS
AFTERNOON...

* WHAT...A long period WNW swell will continue to bring a threat
  of dangerous sneaker waves to area beaches, as well as strong
  rip currents. Moderate to large breaking waves overnight
  into early this morning.

* WHEN...Through this afternoon.

* WHERE...San Francisco, Coastal North Bay Including Point Reyes 
  National Seashore, San Francisco Peninsula Coast and Southern 
  Monterey Bay and Big Sur Coast Counties.

* IMPACTS...Sneaker waves will create dangerous conditions at area
  beaches. Steep beaches will have a higher risk of sneaker wave
  activity with greater wave run-up onto beaches. Occasionally
  larger waves will also wash over jetties and rock outcroppings
  that normally stay dry.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain out of the water to avoid hazardous swimming conditions.

&&

$$