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Weather Alerts for San Mateo Coast

Issued by the National Weather Service

High Surf Warning  HIGH SURF WARNING   High Surf Warning
SAN MATEO COAST

Areas Affected:
Coastal North Bay Including Point Reyes National Seashore - Northern Monterey Bay - San Francisco - San Francisco Peninsula Coast - Southern Monterey Bay and Big Sur Coast
Effective: Mon, 10/25 2:02pm Updated: Mon, 10/25 4:25pm Urgency: Expected
Expires: Tue, 10/26 11:00am Severity:  Moderate  Certainty: Likely

 
Details:
...A VERY LARGE SWELL TRAIN WILL BRING COASTAL HAZARDS TO WEST TO
NORTHWEST FACING BEACHES...
A strong storm has been impacting the area and will continue to
significantly increase wave energy into early Tuesday. This wave
energy will transition through the coastal waters and peak this
afternoon. Swell of 16 to 24 feet at 16 to 18 seconds is forecast
to arrive with the 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 remains in effect until 11AM Tuesday,
with the highest risks once again at west to northwest facing
beaches.
...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 11 AM PDT TUESDAY...
* 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
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...Until 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.

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

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