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  1. What are spring and neap tides? - NOAA's National Ocean Service

    Spring tides occur twice each lunar month all year long without regard to the season. 'Neap tides,' which also occur twice a month, happen when the sun and moon are at right angles to each …

  2. What is a King Tide? - NOAA's National Ocean Service

    A King Tide is a popular, non-scientific term people often use to describe exceptionally high tides that occur during a new or full moon.

  3. Tidal Variations - The Influence of Position and Distance - Tides …

    When the sun, moon, and Earth are in alignment (at the time of the new or full moon), the solar tide has an additive effect on the lunar tide, creating extra-high high tides, and very low, low …

  4. What is a perigean spring tide? - NOAA's National Ocean Service

    The difference between perigean spring tides and spring tides that occur closer to the moon’s apogee are location dependent and significantly influenced by tidal range, but can be quite large.

  5. Tides and Water Levels - NOAA's National Ocean Service

    An area has a semidiurnal tidal cycle if it experiences two high and two low tides of approximately equal size every lunar day. Many areas on the eastern coast of North America experience …

  6. Do the Great Lakes have tides? - NOAA's National Ocean Service

    Jun 16, 2024 · Studies indicate that the Great Lakes spring tide, the largest tides caused by the combined forces of the sun and moon, is less than five centimeters in height.

  7. In 2023, NOAA’s seasonal High Tide Bulletin was superceded by a digital Monthly Outlook. NOAA formatted its record of past bulletins into the following portable document format (PDF) to …

  8. Visualization of dead zone along the northern Gulf of Mexico continental shelf (red and yellow areas) that is formed in the spring through summer in response to nutrient loading from the …

  9. Coastal Flooding in California: What You Need to Know

    These higher than normal "spring" tides occur during a new or full moon and when the Earth is at its perigee, or during specific seasons around the country. In California and much of the West …

  10. Tides and Water Levels: NOAA's National Ocean Service Education

    When the sun, moon, and Earth are in alignment (at the time of the new or full moon), the solar tide has an additive effect on the lunar tide, creating extra-high high tides, and very low, low …