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Weather Alerts for San Francisco

Issued by the National Weather Service

Coastal Flood Advisory  COASTAL FLOOD ADVISORY   Coastal Flood Advisory
SAN FRANCISCO

Areas Affected:
North Bay Interior Valleys - San Francisco - San Francisco Bay Shoreline
Effective: Sat, 12/4 1:38am Updated: Sat, 12/4 3:10am Urgency: Expected
Expires: Sun, 12/5 3:00pm Severity: Minor Certainty: Likely

 
Details:
...KING TIDES WILL CAUSE MINOR COASTAL FLOODING AT LOW LYING
SPOTS DURING HIGH TIDE TODAY AND SUNDAY...
.The highest astronomical tides of the year, commonly referred to
as the King Tides, will again impact the coast today and Sunday.
King Tides occur when tidal forces maximize as the moon, earth,
and sun come into alignment while the moon is in perigee (nearest
to the earth) and the earth is at perihelion (nearest to the sun).
These tides will peak during the mid to late morning and have
historically resulted in the localized flooding of specific low
lying areas each year. In addition, the lowest low tides of the
season will follow hours later in the afternoons. The King Tides
tidal readings are expected to peak today.
...COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 3 PM PST
SUNDAY...
* WHAT...Minor coastal flooding expected at prone low lying
coastal locations across the San Francisco Bay shoreline during
peak high tide today and Sunday.
* WHERE...North Bay Interior Valleys, San Francisco Bay
Shoreline and San Francisco.
* WHEN...Through 3 PM PST Sunday. The highest high tides are
expected to occur during the mid to late mornings while the
lowest low tides will occur during the mid afternoon to early
evenings. Please refer to local tidal data forecasts available
for San Francisco, Redwood City, or Alameda at
www.tidesandcurrents.noaa.gov for more specific details.
* IMPACTS...Flooding of areas previously impacted by King Tide
events is expected, including low lying lots, parks, and roads
throughout the San Francisco Bay Shoreline with the highest
high tides. Difficulty navigating shallow bay waters during
the lowest low tides.
* ADDITIONAL DETAILS...Tide poolers and beachgoers should be
familiar with the times and heights of local tidal levels to
avoid hazards that may arise from rapidly shifting water
levels. King Tide impacts may also be observed as an insight
into what typical water levels may be in the future with
additional sea level rise.

Information:
If travel is required, allow extra time as some roads may be
closed. Do not drive around barricades or through water of
unknown depth. Take the necessary actions to protect flood-prone
property.

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