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AK · NOAA 9455090 · 60° 07′ N · 149° 26′ W
Tides at Seward
A mixed, mainly semidiurnal tide (form factor 0.47), spring this week. Predicted from the station's 34 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, 1:04 PM | High | 12.3 ft |
| Sun, Oct 25, 7:37 PM | Low | -1.1 ft |
| Mon, Oct 26, 1:54 AM | High | 10.5 ft |
| Mon, Oct 26, 7:34 AM | Low | 2.0 ft |
| Mon, Oct 26, 1:38 PM | High | 12.9 ft |
| Mon, Oct 26, 8:17 PM | Low | -1.8 ft |
| Tue, Oct 27, 2:38 AM | High | 10.5 ft |
| Tue, Oct 27, 8:11 AM | Low | 2.4 ft |
| Tue, Oct 27, 2:14 PM | High | 13.2 ft |
| Tue, Oct 27, 8:59 PM | Low | -2.0 ft |
| Wed, Oct 28, 3:23 AM | High | 10.3 ft |
| Wed, Oct 28, 8:50 AM | Low | 2.9 ft |
| Wed, Oct 28, 2:53 PM | High | 13.2 ft |
| Wed, Oct 28, 9:44 PM | Low | -1.8 ft |
| Thu, Oct 29, 4:12 AM | High | 9.8 ft |
| Thu, Oct 29, 9:33 AM | Low | 3.4 ft |
| Thu, Oct 29, 3:36 PM | High | 12.7 ft |
| Thu, Oct 29, 10:35 PM | Low | -1.2 ft |
| Fri, Oct 30, 5:07 AM | High | 9.2 ft |
| Fri, Oct 30, 10:22 AM | Low | 4.1 ft |
| Fri, Oct 30, 4:25 PM | High | 12.0 ft |
| Fri, Oct 30, 11:31 PM | Low | -0.5 ft |
| Sat, Oct 31, 6:12 AM | High | 8.7 ft |
| Sat, Oct 31, 11:22 AM | Low | 4.6 ft |
| Sat, Oct 31, 5:24 PM | High | 10.9 ft |
| Sun, Nov 1, 12:34 AM | Low | 0.3 ft |
| Sun, Nov 1, 6:30 AM | High | 8.5 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| M2 | 3.9 ft | 288.0° |
| K1 | 1.5 ft | 272.9° |
| S2 | 1.3 ft | 319.5° |
| O1 | 0.9 ft | 257.7° |
| N2 | 0.8 ft | 264.0° |
| P1 | 0.5 ft | 268.8° |
| SA | 0.5 ft | 242.9° |
| K2 | 0.4 ft | 312.7° |
The eight largest of 34. Source: NOAA CO-OPS harmonic constituents for 9455090, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 12:24 the gauge read 11.1 ft, 0.9 ft below the computed curve: wind and pressure, not the moon. The widest gap of the two days was 1.3 ft, at Fri, Oct 23 21:36.
- 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 01:00 | 9.05 ft | 10.28 ft | 10.21 ft |
| Sun, Oct 25 02:00 | 8.82 ft | 9.92 ft | 9.86 ft |
| Sun, Oct 25 03:00 | 7.51 ft | 8.49 ft | 8.44 ft |
| Sun, Oct 25 04:00 | 5.39 ft | 6.36 ft | 6.32 ft |
| Sun, Oct 25 05:00 | 3.22 ft | 4.07 ft | 4.05 ft |
| Sun, Oct 25 06:00 | 1.31 ft | 2.35 ft | 2.34 ft |
| Sun, Oct 25 07:00 | 0.87 ft | 1.72 ft | 1.73 ft |
| Sun, Oct 25 08:00 | 1.66 ft | 2.40 ft | 2.42 ft |
| Sun, Oct 25 09:00 | 3.56 ft | 4.25 ft | 4.29 ft |
| Sun, Oct 25 10:00 | 5.97 ft | 6.82 ft | 6.87 ft |
| Sun, Oct 25 11:00 | 8.66 ft | 9.45 ft | 9.51 ft |
| Sun, Oct 25 12:00 | 10.66 ft | 11.46 ft | 11.52 ft |
Measured heights from NOAA CO-OPS station 9455090, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.