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whus46 kmtr 042057

coastal hazard message
national weather service san francisco ca
1257 pm pst sat dec 4 2021

...king tides will cause minor coastal flooding at low lying
spots during high tide through sunday...

.the highest astronomical tides of the year, commonly referred to
as the king tides, will again impact the coast through 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.

san francisco-north bay interior valleys-
san francisco bay shoreline-
1257 pm pst sat dec 4 2021

...coastal flood advisory remains in effect until 3 pm pst

* 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...low lying areas of the san francisco bay shoreline.

* when...until 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 several coastal and bayshore locations at

* 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.

precautionary/preparedness actions...

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



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