High Surf Advisory 8, NWS San Francisco Bay Area, CA

Issued

Oct 26, 2021, 10:41 AM PDT (17:41 UTC)

In effect from

Oct 26, 2021, 11:00 AM PDT

Expired

Oct 26, 2021, 8:00 PM PDT

In force

9 hr

Issued by

NWS San Francisco Bay Area, CA

Counties City and County of San Francisco, CA, Marin County, CA, Monterey County, CA, San Mateo County, CA, Santa Cruz County, CA, Sonoma County, CA

The San Francisco radar (KMUX), 53 km from the middle of the area, began a volume at 17:40 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

772 
WHUS46 KMTR 261741
CFWMTR

Coastal Hazard Message
National Weather Service San Francisco CA
1041 AM PDT Tue Oct 26 2021

...A LARGE SWELL TRAIN WILL CONTINUE TO BRING COASTAL HAZARDS TO 
WEST TO NORTHWEST FACING BEACHES...

Although swell heights and periods have begun to subside, coastal
buoys still report swell heights of 15 to 16 feet at 14 to 16
seconds. This will continue to generate hazardous beach conditions
the rest of the day. These hazards include large breaking waves 
of 18 to 24 feet (higher at favored break points), increased risk
of strong longshore and rip currents, increased risk of coastal 
erosion, and enhanced coastal run up concerns due to the summer 
beach profiles in place. Wave energy has the potential to move 
onto the beach and overtake individuals, potentially injuring 
them, or pulling them into the cold ocean. Each year, people die 
at the coast due to these or similar ocean conditions. The high 
surf warning will be allowed to expire at 11AM Tuesday, however, a
high surf advisory will then take effect until 8 PM Tuesday 
evening. The highest risks once again for west to northwest facing
beaches. Waves will subside this evening and overnight.

CAZ006-505-509-529-530-270300-
/O.EXP.KMTR.SU.W.0002.000000T0000Z-211026T1800Z/
/O.NEW.KMTR.SU.Y.0008.211026T1800Z-211027T0300Z/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
San Francisco Peninsula Coast-Northern Monterey Bay-
Southern Monterey Bay and Big Sur Coast-
1041 AM PDT Tue Oct 26 2021

...HIGH SURF ADVISORY IN EFFECT UNTIL 8 PM PDT THIS EVENING...
...HIGH SURF WARNING WILL EXPIRE AT 11 AM PDT THIS MORNING...

* WHAT...Large breaking waves of 18 to 24 feet, increased coastal
  run up, strong rip currents, and longshore currents..

* WHERE...Entire Pacific Coast from Sonoma to Monterey county. 
  Highest risk at west to northwest facing beaches, including 
  but not limited to: Ocean Beach, Montara State Beach, Half 
  Moon Bay State Beach, Manresa State Beach, and Marina State 
  Beach. 

* WHEN...Until 8 PM PDT this evening.

* IMPACTS...Breaking waves can sweep people off jetties and docks,
  and into dangerous seas. Dangerous swimming and surfing 
  conditions and localized beach erosion.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced swimmers should remain out of the water due to
dangerous surf conditions.

&&

$$

350 
WHUS46 KMTR 270254
CFWMTR

Coastal Hazard Message
National Weather Service San Francisco CA
754 PM PDT Tue Oct 26 2021

...Significant wave heights have decreased High surf advisory
expires...

.High surf advisory expires.

CAZ006-505-509-529-530-270400-
/O.EXP.KMTR.SU.Y.0008.000000T0000Z-211027T0300Z/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
San Francisco Peninsula Coast-Northern Monterey Bay-
Southern Monterey Bay and Big Sur Coast-
754 PM PDT Tue Oct 26 2021

...HIGH SURF ADVISORY WILL EXPIRE AT 8 PM PDT THIS EVENING...

Significant wave heights have decrease to 10 to 15 feet over the
coastal waters. 

$$

High Surf Advisories in California, 2021Every high surf advisory in 2021

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.