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HI · NOAA 1612340 · 21° 18′ N · 157° 52′ W
Tides at Honolulu
A mixed, mainly semidiurnal tide (form factor 1.01), spring this week. Predicted from the station's 31 harmonic constants; heights above mean lower low water, times in station time. Weather is not in these numbers.
This week
| When | Water | Height |
|---|---|---|
| Sun, Oct 25, 3:10 PM | High | 1.3 ft |
| Sun, Oct 25, 9:02 PM | Low | -0.1 ft |
| Mon, Oct 26, 4:07 AM | High | 2.3 ft |
| Mon, Oct 26, 10:56 AM | Low | 0.4 ft |
| Mon, Oct 26, 3:47 PM | High | 1.1 ft |
| Mon, Oct 26, 9:30 PM | Low | -0.1 ft |
| Tue, Oct 27, 4:51 AM | High | 2.4 ft |
| Tue, Oct 27, 11:57 AM | Low | 0.4 ft |
| Tue, Oct 27, 4:28 PM | High | 0.9 ft |
| Tue, Oct 27, 10:03 PM | Low | -0.1 ft |
| Wed, Oct 28, 5:39 AM | High | 2.5 ft |
| Wed, Oct 28, 1:05 PM | Low | 0.4 ft |
| Wed, Oct 28, 5:14 PM | High | 0.7 ft |
| Wed, Oct 28, 10:39 PM | Low | -0.0 ft |
| Thu, Oct 29, 6:33 AM | High | 2.4 ft |
| Thu, Oct 29, 2:23 PM | Low | 0.4 ft |
| Thu, Oct 29, 6:15 PM | High | 0.6 ft |
| Thu, Oct 29, 11:22 PM | Low | 0.1 ft |
| Fri, Oct 30, 7:34 AM | High | 2.3 ft |
| Fri, Oct 30, 3:44 PM | Low | 0.3 ft |
| Fri, Oct 30, 7:52 PM | High | 0.5 ft |
| Sat, Oct 31, 12:19 AM | Low | 0.2 ft |
| Sat, Oct 31, 8:41 AM | High | 2.2 ft |
| Sat, Oct 31, 4:52 PM | Low | 0.3 ft |
| Sat, Oct 31, 9:55 PM | High | 0.6 ft |
| Sun, Nov 1, 1:47 AM | Low | 0.4 ft |
| Sun, Nov 1, 9:49 AM | High | 2.1 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| M2 | 0.6 ft | 59.4° |
| K1 | 0.5 ft | 226.8° |
| O1 | 0.3 ft | 215.9° |
| S2 | 0.2 ft | 54.7° |
| SA | 0.2 ft | 177.7° |
| P1 | 0.1 ft | 224.9° |
| N2 | 0.1 ft | 48.8° |
| K2 | 0.1 ft | 45.7° |
The eight largest of 31. Source: NOAA CO-OPS harmonic constituents for 1612340, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 10:18 the gauge read 0.6 ft, 0.2 ft above the computed curve: wind and pressure, not the moon. The widest gap of the two days was 0.3 ft, at Sun, Oct 25 08:18.
- Computed here, from the constants
- NOAA's own prediction
- Measured at the gauge, every six minutes
The last twelve hours as numbers
| Station time | Measured | Computed here | NOAA |
|---|---|---|---|
| Sat, Oct 24 23:00 | 0.75 ft | 0.56 ft | 0.55 ft |
| Sun, Oct 25 00:00 | 1.22 ft | 1.05 ft | 1.04 ft |
| Sun, Oct 25 01:00 | 1.73 ft | 1.53 ft | 1.53 ft |
| Sun, Oct 25 02:00 | 2.10 ft | 1.92 ft | 1.93 ft |
| Sun, Oct 25 03:00 | 2.30 ft | 2.13 ft | 2.14 ft |
| Sun, Oct 25 04:00 | 2.37 ft | 2.12 ft | 2.14 ft |
| Sun, Oct 25 05:00 | 2.10 ft | 1.90 ft | 1.91 ft |
| Sun, Oct 25 06:00 | 1.72 ft | 1.52 ft | 1.54 ft |
| Sun, Oct 25 07:00 | 1.40 ft | 1.09 ft | 1.11 ft |
| Sun, Oct 25 08:00 | 0.97 ft | 0.72 ft | 0.73 ft |
| Sun, Oct 25 09:00 | 0.71 ft | 0.46 ft | 0.48 ft |
| Sun, Oct 25 10:00 | 0.56 ft | 0.37 ft | 0.39 ft |
Measured heights from NOAA CO-OPS station 1612340, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.