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AK · NOAA 9457292 · 57° 44′ N · 152° 31′ W
Tides at Kodiak Island
A mixed, mainly semidiurnal tide (form factor 0.51), spring this week. Predicted from the station's 35 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, 1:45 PM | High | 9.8 ft |
| Sun, Oct 25, 8:17 PM | Low | -1.0 ft |
| Mon, Oct 26, 2:38 AM | High | 8.2 ft |
| Mon, Oct 26, 8:10 AM | Low | 1.6 ft |
| Mon, Oct 26, 2:19 PM | High | 10.4 ft |
| Mon, Oct 26, 8:57 PM | Low | -1.5 ft |
| Tue, Oct 27, 3:22 AM | High | 8.1 ft |
| Tue, Oct 27, 8:48 AM | Low | 1.9 ft |
| Tue, Oct 27, 2:55 PM | High | 10.7 ft |
| Tue, Oct 27, 9:40 PM | Low | -1.7 ft |
| Wed, Oct 28, 4:08 AM | High | 7.9 ft |
| Wed, Oct 28, 9:27 AM | Low | 2.3 ft |
| Wed, Oct 28, 3:35 PM | High | 10.8 ft |
| Wed, Oct 28, 10:26 PM | Low | -1.5 ft |
| Thu, Oct 29, 4:58 AM | High | 7.5 ft |
| Thu, Oct 29, 10:09 AM | Low | 2.8 ft |
| Thu, Oct 29, 4:19 PM | High | 10.5 ft |
| Thu, Oct 29, 11:16 PM | Low | -1.1 ft |
| Fri, Oct 30, 5:54 AM | High | 7.1 ft |
| Fri, Oct 30, 10:58 AM | Low | 3.2 ft |
| Fri, Oct 30, 5:09 PM | High | 9.9 ft |
| Sat, Oct 31, 12:11 AM | Low | -0.5 ft |
| Sat, Oct 31, 6:58 AM | High | 6.7 ft |
| Sat, Oct 31, 11:56 AM | Low | 3.7 ft |
| Sat, Oct 31, 6:08 PM | High | 9.0 ft |
| Sun, Nov 1, 1:15 AM | Low | 0.2 ft |
| Sun, Nov 1, 7:13 AM | High | 6.6 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| M2 | 3.2 ft | 307.4° |
| K1 | 1.3 ft | 288.5° |
| S2 | 1.1 ft | 340.9° |
| O1 | 0.8 ft | 272.7° |
| N2 | 0.7 ft | 283.5° |
| P1 | 0.4 ft | 284.1° |
| K2 | 0.3 ft | 332.1° |
| SA | 0.3 ft | 246.1° |
The eight largest of 35. Source: NOAA CO-OPS harmonic constituents for 9457292, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 12:24 the gauge read 8.1 ft, 0.8 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 20:36.
- 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 | 6.54 ft | 7.64 ft | 7.59 ft |
| Sun, Oct 25 02:00 | 6.87 ft | 8.02 ft | 7.97 ft |
| Sun, Oct 25 03:00 | 6.63 ft | 7.47 ft | 7.43 ft |
| Sun, Oct 25 04:00 | 5.41 ft | 6.15 ft | 6.11 ft |
| Sun, Oct 25 05:00 | 3.51 ft | 4.37 ft | 4.34 ft |
| Sun, Oct 25 06:00 | 1.75 ft | 2.64 ft | 2.62 ft |
| Sun, Oct 25 07:00 | 0.70 ft | 1.54 ft | 1.53 ft |
| Sun, Oct 25 08:00 | 0.65 ft | 1.45 ft | 1.46 ft |
| Sun, Oct 25 09:00 | 1.44 ft | 2.37 ft | 2.39 ft |
| Sun, Oct 25 10:00 | 3.27 ft | 4.07 ft | 4.10 ft |
| Sun, Oct 25 11:00 | 5.39 ft | 6.19 ft | 6.23 ft |
| Sun, Oct 25 12:00 | 7.38 ft | 8.20 ft | 8.25 ft |
Measured heights from NOAA CO-OPS station 9457292, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.