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A perigean spring tide will be occurring. They happen in periods of around 6 hours between each other and represent both the highest and lowest level … The high tide is always the larger number in a tide chart, sometimes with a plus sign before it. This is when the moon is either new or full and closest to earth. In the chart below the high tides are marked with the letter H in the High/Low column, so it is really easy to find them. This number shows how high above Chart Datum the tide will be at its greatest swell. Perigean Spring Tide. Tides originate in the oceans and progress toward the coastlines where they appear as the regular rise and fall of the sea surface. When the highest part, or crest, of the wave reaches a particular location, high tide occurs; low tide corresponds to the lowest part of the wave, or its trough. See more. The tide chart above shows the height and times of high tide and low tide for Virginia Beach, Virginia. The tide chart above shows the height and times of high tide and low tide for Morro Bay, California. The size of the high and low tides change over the month. There are two high tides and two low tides each day. The strongest flood and ebb currents usually occur before or near the time of the high and low tides. Each day, four different tides occur---two high tides and two low tides. A high tide indicated as an 8 tells you that at its highest, the water will be 8 feet (2.4 m) above the average low water mark. 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. Tide Times are PST (UTC -8.0hrs). Seven days after a spring tide, the sun and moon are at right angles to each other. Let us look at some examples. Sunrise is at 7:13am and sunset is at 4:57pm. High tide will be expressed as a positive number, sometimes with a plus (+) sign before it. The gravitational forces of the moon, Earth and sun affect the ocean tides. When this happens, the bulge of the ocean caused by the sun partially cancels out the bulge of the ocean caused by the moon. Where might I expect High Tide Flooding? Find high tide information. Higher than normal high tides and lower than normal low tides will occur. The weakest currents occur between the flood and ebb currents and are called slack tides. The red flashing dot shows the tide time right now. The grey shading corresponds to nighttime hours between sunset and sunrise at Virginia Beach. High tides and low tides are stages of the tidal cycle. During a perigean spring tide, those areas that normally experience frequent high tide flooding may see even higher levels of inundation with longer duration.In this image, a perigee moon coincides with high tide to cause coastal flooding conditions at Hains Point, Washington D.C. on September 26, 2015. 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