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San Pablo Bay was named after Rancho San Pablo, a Spanish land grant given to colonial Alta California settlers in 1815, on the bay at the site of the present-day city of San Pablo. The bay is approximately 10 mi (16 km) across and has an area of approximately 90 sq mi (230 km 2 ).
Tide tables, sometimes called tide charts, are used for tidal prediction and show the daily times and levels of high and low tides, usually for a particular location. [1] Tide heights at intermediate times (between high and low water) can be approximated by using the rule of twelfths or more accurately calculated by using a published tidal ...
Tide tables forecast the time of the next high water. [6] [7] The difference between these two times is the lunitidal interval. This value can be used to calibrate tide clock and wristwatches to allow for simple but crude tidal predictions. Unfortunately, the lunitidal intervals vary day-by-day even at a given location.
When the clock reaches the halfway point ("half-tide"), it then counts the hours up to high tide or low tide, as in "one hour until high or low tide". Generally, there is an adjustment knob on the back on the instrument which may be used to set the tide using official tide tables for a specific location at either high or low tide.
It is also one of six major coastal currents affiliated with strong upwelling zones, the others being the Humboldt Current, the Canary Current, the Benguela Current, the Oyashio Current, and the Somali Current. The California Current is part of the North Pacific Gyre, a large swirling current that occupies the northern basin of the Pacific.
The Avila Beach and San Simeon piers were already closed due to existing damage and sustained a new round of nature’s wrath. Large waves hammer the Avila Beach Pier on Thursday, Dec. 29, 2023.
River otter in the Bay were first reported in Redwood Creek at Muir Beach in 1996, [64] and recently in Corte Madera Creek, and in the south Bay on Coyote Creek, [65] as well as in 2010 in San Francisco Bay itself at the Richmond Marina. For the first time in 65 years, Pacific Harbor Porpoise (Phocoena phocoena) returned to the Bay in 2009. [66]
At neap tides the semi-diurnal tide is virtually absent, resulting in the phenomenon known as a "dodge tide" [6] [7] —a day-long period of slack water—occurring twice a month; this effect is accentuated near the equinoxes when the diurnal component also vanishes, resulting in a period of 2–3 days of slack water. [8] [9] [10]