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Marshall Is. · NOAA 1820000 · 8° 44′ N · 167° 44′ E
Tides at Kwajalein, Marshall Islands
A semidiurnal tide (form factor 0.23), spring this week. Predicted from the station's 30 harmonic constants; heights above mean lower low water, times in station time. Weather is not in these numbers.
This week
| When | Water | Height |
|---|---|---|
| Mon, Oct 26, 9:52 AM | Low | -0.9 ft |
| Mon, Oct 26, 4:08 PM | High | 4.7 ft |
| Mon, Oct 26, 10:25 PM | Low | -1.0 ft |
| Tue, Oct 27, 4:24 AM | High | 4.0 ft |
| Tue, Oct 27, 10:23 AM | Low | -0.9 ft |
| Tue, Oct 27, 4:41 PM | High | 4.8 ft |
| Tue, Oct 27, 11:03 PM | Low | -1.0 ft |
| Wed, Oct 28, 5:00 AM | High | 3.7 ft |
| Wed, Oct 28, 10:55 AM | Low | -0.7 ft |
| Wed, Oct 28, 5:16 PM | High | 4.7 ft |
| Wed, Oct 28, 11:43 PM | Low | -0.8 ft |
| Thu, Oct 29, 5:38 AM | High | 3.4 ft |
| Thu, Oct 29, 11:29 AM | Low | -0.5 ft |
| Thu, Oct 29, 5:54 PM | High | 4.5 ft |
| Fri, Oct 30, 12:27 AM | Low | -0.4 ft |
| Fri, Oct 30, 6:19 AM | High | 2.9 ft |
| Fri, Oct 30, 12:06 PM | Low | -0.1 ft |
| Fri, Oct 30, 6:37 PM | High | 4.0 ft |
| Sat, Oct 31, 1:19 AM | Low | -0.0 ft |
| Sat, Oct 31, 7:08 AM | High | 2.4 ft |
| Sat, Oct 31, 12:48 PM | Low | 0.4 ft |
| Sat, Oct 31, 7:30 PM | High | 3.5 ft |
| Sun, Nov 1, 2:28 AM | Low | 0.4 ft |
| Sun, Nov 1, 8:21 AM | High | 2.0 ft |
| Sun, Nov 1, 1:48 PM | Low | 0.9 ft |
| Sun, Nov 1, 8:48 PM | High | 3.1 ft |
| Mon, Nov 2, 4:16 AM | Low | 0.7 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| M2 | 1.5 ft | 128.0° |
| S2 | 0.9 ft | 148.6° |
| K1 | 0.3 ft | 65.9° |
| N2 | 0.3 ft | 126.9° |
| K2 | 0.2 ft | 144.9° |
| O1 | 0.2 ft | 39.6° |
| SA | 0.2 ft | 48.8° |
| P1 | 0.1 ft | 67.0° |
The eight largest of 30. Source: NOAA CO-OPS harmonic constituents for 1820000, public domain.
The year as a print
The last two days, measured
At Mon, Oct 26 08:18 the gauge read -0.8 ft, 0.7 ft below the computed curve: wind and pressure, not the moon. The widest gap of the two days was 0.7 ft, at Mon, Oct 26 07:42.
- 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 |
|---|---|---|---|
| Sun, Oct 25 21:00 | -1.10 ft | -0.59 ft | -0.57 ft |
| Sun, Oct 25 22:00 | -1.32 ft | -0.80 ft | -0.79 ft |
| Sun, Oct 25 23:00 | -0.82 ft | -0.37 ft | -0.36 ft |
| Mon, Oct 26 00:00 | 0.10 ft | 0.60 ft | 0.60 ft |
| Mon, Oct 26 01:00 | 1.23 ft | 1.84 ft | 1.84 ft |
| Mon, Oct 26 02:00 | 2.41 ft | 3.02 ft | 3.02 ft |
| Mon, Oct 26 03:00 | 3.20 ft | 3.83 ft | 3.83 ft |
| Mon, Oct 26 04:00 | 3.40 ft | 4.05 ft | 4.04 ft |
| Mon, Oct 26 05:00 | 2.90 ft | 3.63 ft | 3.62 ft |
| Mon, Oct 26 06:00 | 1.98 ft | 2.68 ft | 2.66 ft |
| Mon, Oct 26 07:00 | 0.72 ft | 1.44 ft | 1.42 ft |
| Mon, Oct 26 08:00 | -0.47 ft | 0.23 ft | 0.21 ft |
Measured heights from NOAA CO-OPS station 1820000, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.