Moon · tides
The tidal bulges
The Moon’s pull stretches the ocean into two bulges, one facing it, one opposite. The Sun strengthens the effect when aligned (spring tides) and weakens it at the quarters (neap tides). The animation runs one lunation from today’s position.
- Regime
- —
Moon’s elongation
147 °
Relative amplitude
1.19
Latest measured hour
1,381 mm
Meeus (1998) · Published literature; cited
UHSLC fast-delivery hourly sea level, Honolulu (station 057) · Free use with citation of Caldwell, Merrifield & Thompson (2015) · 10/23/26
Bulges greatly exaggerated; solar to lunar tidal force ratio ≈ 0.46. Real tides also depend on the ocean basins.
Latest measured hour
1,381 mm
2026-08-31T23:00
UHSLC fast-delivery hourly sea level, Honolulu (station 057) · Free use with citation of Caldwell, Merrifield & Thompson (2015) · 10/23/26
Highest hour of the imported period
2,182 mm
2020-12-15T15:00
UHSLC fast-delivery hourly sea level, Honolulu (station 057) · Free use with citation of Caldwell, Merrifield & Thompson (2015) · 10/23/26
Lowest hour of the imported period
1,008 mm
2023-06-04T19:00
UHSLC fast-delivery hourly sea level, Honolulu (station 057) · Free use with citation of Caldwell, Merrifield & Thompson (2015) · 10/23/26
Hours available
102,083
2015-01-01 → 2026-08-31
since 2015 (fast-delivery data)
UHSLC fast-delivery hourly sea level, Honolulu (station 057) · Free use with citation of Caldwell, Merrifield & Thompson (2015) · 10/23/26
Hourly water level at Honolulu, latest available month
UHSLC fast-delivery hourly sea level, Honolulu (station 057) · Free use with citation of Caldwell, Merrifield & Thompson (2015) · 10/23/26
Show the data as a table
Last eight days
UHSLC fast-delivery hourly sea level, Honolulu (station 057) · Free use with citation of Caldwell, Merrifield & Thompson (2015) · 10/23/26
Show the data as a table
Highest daily high water, last two years
UHSLC fast-delivery hourly sea level, Honolulu (station 057) · Free use with citation of Caldwell, Merrifield & Thompson (2015) · 10/23/26
Show the data as a table
Monthly mean since 2015
UHSLC fast-delivery hourly sea level, Honolulu (station 057) · Free use with citation of Caldwell, Merrifield & Thompson (2015) · 10/23/26
Show the data as a table
Method and sources
Hourly heights come from the University of Hawaii Sea Level Center fast-delivery stream (station 057, Honolulu), in mm relative to the station datum; missing hours (−32767) are discarded and only years from 2015 are imported. Daily maxima and monthly means are computed on the server.
The astronomical tide is the ocean’s response to the tide-generating potential of the Moon and Sun; its constituents (M2, S2, K1, O1…) are not fitted here.
Reading these data
Data not fully quality-controlled (fast delivery); meteorological surges add to the astronomical tide. A single station is shown: tidal regimes differ strongly between sites.
SOURCES OF THIS PAGE
- Meeus (1998)
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Meeus, J. (1998). Astronomical Algorithms, 2nd ed. Willmann-Bell.
Licence : Published literature; cited - UHSLC fast-delivery hourly sea level, Honolulu (station 057)
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Caldwell, P. C., Merrifield, M. A., & Thompson, P. R. (2015). Sea level measured by tide gauges from global oceans — the Joint Archive for Sea Level holdings (NCEI Accession 0019568), Version 5.5. Fast-delivery hourly data, Honolulu (UHSLC 057).
· doi:10.7289/V5V40S7W · source page ↗
Licence : Free use with citation of Caldwell, Merrifield & Thompson (2015) · retrieved on Oct 23, 2026 · SHA-256 63871b13f05f… - Caldwell et al. (2015)
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Caldwell, P. C., Merrifield, M. A., & Thompson, P. R. (2015). Sea level measured by tide gauges from global oceans — the Joint Archive for Sea Level holdings (NCEI Accession 0019568), Version 5.5. NOAA National Centers for Environmental Information.
· doi:10.7289/V5V40S7W
Licence : Published literature; cited