About Tides
Tides work.Figure 24.27: A spring tide.Figure 24.28: A neap tide.The first picture shows what is called a spring tide. Confusingly, this tide has nothing to do with the season “Spring”, but means that the tide waters seem to spring forth. During a spring tide, the Sun and Moon are in line. This happens at both the new moon and the full moon. The Sun’s gravity pulls on Earth’s water, while the Moon’s gravity pulls on the water in the same places. The high tide produced by Sun adds to the high tide produced by the Moon. So spring tides have higher than normal high tides. This water is shown on the picture as the gray bulges on opposite sides of the Earth. Notice that perpendicular to the gray areas, the water is at a relatively low level. The places where the water is being pulled out experience high tides, while the areas perpendicular to them experience low tides. Since the Earth is rotating on its axis, the high-low tide cycle moves around the globe in a 24-hour period.The second picture shows a neap tide. A neap tide occurs when the Earth and Sun are in line but the Moon is perpendicular to the Earth. This happens when the moon is at first or last quarter moon phase. In this case, the pull of gravity from the Sun partially cancels out the pull of gravity from the Moon, and the tides are less pronounced. Neap tides produce less extreme tides than the normal tides. This is because the high tide produced by the Sun adds to the low tide area of the Moon and vice versa. So high tide is not as high and low tide is not as low as it usually might be.Lesson SummaryAs the Earth rotates on its axis and revolves around the Sun, several different effects are produced.When the new moon comes between the Earth and the Sun along the ecliptic, a solar eclipse is produced.When the Earth comes between the full moon and the Sun along the ecliptic, a lunar eclipse occurs.Observing the Moon from Earth, we see a sequence of phases as the side facing us goes from completely darkened to completely illuminated and back again once every 29.5 days.Also as the Moon orbits Earth, it produces tides aligned with the gravitational pull of the Moon.The Sun also produces a smaller solar tide. When the solar and lunar tide align, at new and full moons, we experience higher than normal tidal ranges, called spring tides.At first and last quarter moons, the solar tide and lunar tide interfere with each other, producing lower than normal tidal ranges called neap tides.Review QuestionsThe globe is divided into time
Key features of the Tides that are enabled through these drivers include:
- Tide Times for Tacoma - Tide Times and Tide Charts Worldwide
- Tide Times for Auckland - Tide Times and Tide Charts Worldwide
- Tide Times for Crystal River - Tide Times and Tide Charts
- Tide Times for Pompano Beach - Tide Times and Tide Charts
- Tide Times for Cocoa Beach - Tide Times and Tide Charts
- Tide Times for Philadelphia - Tide Times and Tide Charts Worldwide
- Tide Times for Manila - Tide Times and Tide Charts Worldwide
Forecast & Current RadarM2:00Regional Conditions, Almanac or Tides, 36 Hour Forecast, Outlook, Regional Forecast, Extended Forecast & Local Radar1995-1999[]FlavorLength(Minutes and Seconds)Segments FeaturedWith "Air Quality"With "Marine Forecast"D*1:00Latest Observations, Local Update, 36 Hour Forecast & Current RadarE*1:00Local Update, 36 Hour Forecast, Extended Forecast & Current RadarJ/LL3:00Current Conditions, Latest Observations, Regional Conditions, 36 Hour Forecast, Extended Forecast, Almanac or Tides, Travel Cities Forecast, Regional Forecast & Local RadarCurrent Conditions, Regional Conditions, 36 Hour Forecast, Extended Forecast, Air Quality, Almanac or Tides, Travel Cities Forecast, Regional Forecast & Local RadarCurrent Conditions, Regional Conditions, 36 Hour Forecast, Extended Forecast, Marine Forecast, Tides, Travel Cities Forecast, Regional Forecast & Local RadarK*1:30Current Conditions, Regional Conditions, Local Radar, Local Update, 36 Hour Forecast & Extended ForecastK1:30Current Conditions, Latest Observations, 36 Hour Forecast, Extended Forecast & Local RadarLM*2:00Current Conditions, Latest Observations, Regional Conditions, Regional Forecast, Local Update, Local Radar, 36 Hour Forecast, Extended Forecast & Almanac or TidesLM2:00Current Conditions, Latest Observations, Regional Forecast, Regional Conditions, 36 Hour Forecast, Extended Forecast, Almanac or Tides & Local Radar(flavors marked with * features "Local Update")1990-2014[]FlavorAddedLength(Minutes and Seconds)Segments FeaturedNotesDE19991:00Current Conditions, 36-hour Forecast, Extended Forecast & Current Radar.Used at :28 and :58 during special programs.K19901:30Current Conditions, Latest Observations, 36-hour Forecast, Extended Forecast & Local Radar.Used at :18 and :48 during normal programs.LM19982:00Current Conditions, Latest Observations, Regional Forecast, Regional Conditions, 36 Hour Forecast, Extended Forecast, Almanac or Tides & Local Radar.Used at :08, :28, :38, and :58 during normal programs.
