PAINTED SHORES
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AK · NOAA 9462620 · 53° 53′ N · 166° 32′ W
Tides at Unalaska
A mixed, mainly diurnal tide (form factor 1.91), toward neap this week. Predicted from the station's 36 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, 4:11 PM | High | 3.3 ft |
| Mon, Oct 26, 12:16 AM | Low | -0.3 ft |
| Mon, Oct 26, 8:33 AM | High | 2.9 ft |
| Mon, Oct 26, 11:14 AM | Low | 2.8 ft |
| Mon, Oct 26, 4:40 PM | High | 3.5 ft |
| Tue, Oct 27, 1:09 AM | Low | -0.7 ft |
| Tue, Oct 27, 9:47 AM | High | 3.3 ft |
| Tue, Oct 27, 12:44 PM | Low | 3.2 ft |
| Tue, Oct 27, 5:25 PM | High | 3.7 ft |
| Wed, Oct 28, 2:04 AM | Low | -1.0 ft |
| Wed, Oct 28, 10:43 AM | High | 3.6 ft |
| Wed, Oct 28, 2:15 PM | Low | 3.4 ft |
| Wed, Oct 28, 6:31 PM | High | 3.8 ft |
| Thu, Oct 29, 3:01 AM | Low | -1.2 ft |
| Thu, Oct 29, 11:27 AM | High | 3.9 ft |
| Thu, Oct 29, 3:41 PM | Low | 3.4 ft |
| Thu, Oct 29, 7:43 PM | High | 3.8 ft |
| Fri, Oct 30, 4:00 AM | Low | -1.2 ft |
| Fri, Oct 30, 12:07 PM | High | 4.0 ft |
| Fri, Oct 30, 4:55 PM | Low | 3.2 ft |
| Fri, Oct 30, 8:55 PM | High | 3.8 ft |
| Sat, Oct 31, 4:57 AM | Low | -1.2 ft |
| Sat, Oct 31, 12:45 PM | High | 4.0 ft |
| Sat, Oct 31, 5:55 PM | Low | 2.9 ft |
| Sat, Oct 31, 10:11 PM | High | 3.6 ft |
| Sun, Nov 1, 4:50 AM | Low | -0.9 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| K1 | 1.1 ft | 318.9° |
| M2 | 0.9 ft | 80.1° |
| O1 | 0.7 ft | 307.1° |
| N2 | 0.4 ft | 32.5° |
| P1 | 0.4 ft | 318.4° |
| SA | 0.2 ft | 265.0° |
| SSA | 0.2 ft | 201.7° |
| Q1 | 0.1 ft | 300.5° |
The eight largest of 36. Source: NOAA CO-OPS harmonic constituents for 9462620, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 12:24 the gauge read 2.3 ft, 0.3 ft below the computed curve: wind and pressure, not the moon. The widest gap of the two days was 0.6 ft, at Sun, Oct 25 05:36.
- 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 | 0.13 ft | 0.51 ft | 0.47 ft |
| Sun, Oct 25 02:00 | 0.52 ft | 0.93 ft | 0.88 ft |
| Sun, Oct 25 03:00 | 1.00 ft | 1.43 ft | 1.39 ft |
| Sun, Oct 25 04:00 | 1.49 ft | 1.92 ft | 1.88 ft |
| Sun, Oct 25 05:00 | 1.70 ft | 2.29 ft | 2.24 ft |
| Sun, Oct 25 06:00 | 1.99 ft | 2.51 ft | 2.46 ft |
| Sun, Oct 25 07:00 | 2.11 ft | 2.58 ft | 2.55 ft |
| Sun, Oct 25 08:00 | 2.06 ft | 2.54 ft | 2.52 ft |
| Sun, Oct 25 09:00 | 2.02 ft | 2.44 ft | 2.42 ft |
| Sun, Oct 25 10:00 | 2.12 ft | 2.37 ft | 2.37 ft |
| Sun, Oct 25 11:00 | 2.12 ft | 2.37 ft | 2.38 ft |
| Sun, Oct 25 12:00 | 2.13 ft | 2.48 ft | 2.50 ft |
Measured heights from NOAA CO-OPS station 9462620, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.