High Surf Advisory 7, NWS San Francisco Bay Area, CA

145 
WHUS46 KMTR 222118
CFWMTR

Coastal Hazard Message
National Weather Service San Francisco CA
218 PM PDT Fri Oct 22 2021

...TWO SEPARATE PROGRESSIVELY LARGER SWELL TRAINS WILL BRING 
COASTAL HAZARDS TO WEST TO NORTHWEST FACING BEACHES...

.A pair of strong, early season storm systems will result in
coastal hazards between today and next Tuesday. The first of these
storm systems is impacting the region today and has already 
generated an area of heightened wave energy. Buoys along our coast
has reported a modest uptick in wave height and period and cams
show some of this increased energy now arriving at the coast.
Large breaking waves of 15 to 20 feet, increased risk of longshore
and rip currents, and enhanced coastal runup are all possible
through the remainder of the day as this intermittent wave energy
washes ashore, especially at west facing beaches. A high surf
advisory is in effect until 11 PM this evening due to this threat.
Then, a very strong atmospheric river storm system will move
through the region late this weekend into early next week. Very
large, long period swell is expected to be generated from this
storm as it passes. This wave energy will then transition through
the coastal waters from late Sunday into Tuesday, and peak on
Monday. Swell of 16 to 24 feet at 16 to 18 seconds is forecast to
arrive with the largest swell train as it peaks on Monday and
result in a number of coastal hazards. These hazards include large
breaking waves of 20 to 30 feet (higher at favored break points),
increased risk of strong longshore and rip currents, increased
risk of coastal erosion and minor coastal flooding, and enhanced 
coastal run up concerns due to the summer beach profiles in place.
Due to the early arrival of these large waves, many beaches are
still transitioning from their summer beach profiles and lack the
features and steepness to resist larger wave run up on coasts.
This means that more of this wave energy will have a chance 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. A high 
surf warning for the entire coast has been issued for this threat 
and is in effect from 11PM Sunday to 11AM Tuesday, with the 
highest risks once again at west to northwest facing beaches. 


CAZ006-505-509-529-530-230600-
/O.NEW.KMTR.SU.W.0002.211025T0600Z-211026T1800Z/
/O.CON.KMTR.SU.Y.0007.000000T0000Z-211023T0600Z/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
San Francisco Peninsula Coast-Northern Monterey Bay-
Southern Monterey Bay and Big Sur Coast-
218 PM PDT Fri Oct 22 2021

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 11 PM PDT THIS
EVENING...
...HIGH SURF WARNING IN EFFECT FROM 11 PM SUNDAY TO 11 AM PDT
TUESDAY...

* WHAT...For today's High Surf Advisory, intermittent large
  breaking waves of 15 to 20 feet, increased coastal run up,
  stronger rip currents and longshore currents. For the High Surf
  Warning, dangerously large breaking waves of 20 to 30 feet,
  greatly increased coastal run up, strong rip currents and
  longshore currents, and increased risk of coastal run up and
  minor coastal flooding in low lying areas.
 
* 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...For the High Surf Advisory, until 11 PM PDT this evening. For
  the High Surf Warning, from 11 PM Sunday to 11 AM PDT Tuesday. 

* IMPACTS...Breaking waves can sweep people off jetties and 
  docks, and into dangerous seas. Life-threatening swimming 
  conditions and significant beach erosion can be expected.

* ADDITIONAL DETAILS...Today's high surf advisory is for
  moderately large intermittent risks and should not downplay the
  expected risk arriving during the high surf warning. The high 
  surf warning will see much stronger wave action and coastal 
  threats, especially on Monday.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Everyone should remain out of the water due to life-threatening
surf conditions. Stay off of jetties, piers, and other waterside
infrastructure.

&&

$$

685 
WHUS46 KMTR 230558
CFWMTR

Coastal Hazard Message
National Weather Service San Francisco CA
1058 PM PDT Fri Oct 22 2021

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

.Strong, early season storm systems will result in coastal 
hazards returning next Tuesday. A very strong atmospheric river
and storm system will move through the region late this weekend
and early next week. Very large, long period swell will accompany
this storm as it passes. This wave energy will transition through
the coastal waters from late Sunday into Tuesday, and peak on 
Monday. Swell of 16 to 24 feet at 16 to 18 seconds is forecast to 
arrive with the largest swell train as it peaks on Monday and 
result in a number of coastal hazards. These hazards include large
breaking waves of 20 to 30 feet (higher at favored break points),
increased risk of strong longshore and rip currents, increased 
risk of coastal erosion and minor coastal flooding, and enhanced 
coastal run up concerns due to the summer beach profiles in place.
Due to the early arrival of these large waves, many beaches are 
still transitioning from their summer beach profiles and lack the 
features and steepness to resist larger wave run up on coasts. 
This means that more of this wave energy will have a chance 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. A high surf
warning for the entire coast has been issued for this threat and 
is in effect from 11PM Sunday to 11AM Tuesday, with the highest 
risks once again at west to northwest facing beaches.

CAZ006-505-509-529-530-231200-
/O.EXP.KMTR.SU.Y.0007.000000T0000Z-211023T0600Z/
/O.CON.KMTR.SU.W.0002.211025T0600Z-211026T1800Z/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
San Francisco Peninsula Coast-Northern Monterey Bay-
Southern Monterey Bay and Big Sur Coast-
1058 PM PDT Fri Oct 22 2021

...HIGH SURF WARNING REMAINS IN EFFECT FROM 11 PM SUNDAY TO 11 AM
PDT TUESDAY...
...HIGH SURF ADVISORY WILL EXPIRE AT 11 PM PDT THIS EVENING...

* WHAT...For the High Surf Warning, dangerously large breaking 
  waves of 20 to 30 feet, greatly increased coastal run up, strong
  rip currents and longshore currents, and increased risk of 
  coastal run up and minor coastal flooding in low lying areas.

* 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...For the High Surf Warning, from 11 PM Sunday to 11 AM 
  PDT Tuesday.

* IMPACTS...Breaking waves can sweep people off jetties and 
  docks, and into dangerous seas. Life-threatening swimming 
  conditions and significant beach erosion can be expected.

* ADDITIONAL DETAILS...The high surf warning will bring strong 
  wave action and coastal threats, especially on Monday.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Everyone should remain out of the water due to life-threatening
surf conditions. Stay off of jetties, piers, and other waterside
infrastructure.

&&

$$