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Ebb is the tidal phase during which the water level is falling and flood the tidal phase during which the water level is rising. The two definitions do not coincide. The first definition is more usual for tidal inlet systems: estuaries, tidal lagoons and tidal rivers; the second definition is more usual for the open coast.
Provides real-time and historical coastal flood information at select locations. Tide Predictions. Official U.S. high and low tide predictions. High Tide Flooding Outlooks. Show when, where, and how often high tide flooding may occur at specific locations. Coastal Condition Forecasts.
The incoming tide along the coast and into the bays and estuaries is called a flood current; the outgoing tide is called an ebb current. The strongest flood and ebb currents usually occur before or near the time of the high and low tides. The weakest currents occur between the flood and ebb currents and are called "slack water" or "slack current".
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What is ebb tide & flood tide?
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Mar 28, 2023 · Tides are another type of wave motion – a change in the ocean water level that typically reaches a high and low twice a day, about six hours apart (called a semi-diurnal tide). The change from low to high tide is called the "flood tide" or “flow”.
The water stops falling, reaching a local minimum called low tide. Sea level rises over several hours, covering the intertidal zone; flood tide. The water stops rising, reaching a local maximum called high tide. Sea level falls over several hours, revealing the intertidal zone; ebb tide.
The Annual High Tide Flooding Outlook provides the number of high tide flooding days predicted for the coming meteorological year (May to April). Data is supplemented with decadal projections for the year 2050, sea level rise scenarios, and high tide flood exposure maps to support long-term coastal planning.
Because the tidal force of the Moon is more than twice as strong as the Sun's, the tides follow the lunar day, not the solar day. It takes half a lunar day, on average 12 hours and 25 minutes, from one high tide to the next, so we have high and low tides nearly twice a day.
