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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 other.

  2. 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.

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

    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 tides — both …

  4. 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 tides — both …

  5. 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.

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

    An area has a diurnal tidal cycle if it experiences one high and one low tide every lunar day. Many areas in the Gulf of Mexico experience these types of tides.

  8. What are tides? - NOAA's National Ocean Service

    Jun 16, 2024 · Tides are very long-period waves that move through the ocean in response to the forces exerted by the moon and sun. Tides originate in the ocean and progress toward the coastlines where …

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

    The following questions are based on information from the Tutorial on Tides and Water Levels

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

    The Tides and Waters Levels Tutorial is an overview of the complex systems that govern the movement of tides and water levels. The Roadmap to Resources complements the information in the tutorial by …