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AK · NOAA 9452210 · 58° 18′ N · 134° 25′ W
Tides at Juneau
A mixed, mainly semidiurnal tide (form factor 0.31), spring this week. Predicted from the station's 33 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, 1:01 PM | High | 18.5 ft |
| Sun, Oct 25, 7:24 PM | Low | -2.3 ft |
| Mon, Oct 26, 1:41 AM | High | 16.8 ft |
| Mon, Oct 26, 7:30 AM | Low | 1.3 ft |
| Mon, Oct 26, 1:35 PM | High | 19.2 ft |
| Mon, Oct 26, 8:03 PM | Low | -3.1 ft |
| Tue, Oct 27, 2:24 AM | High | 16.8 ft |
| Tue, Oct 27, 8:08 AM | Low | 1.8 ft |
| Tue, Oct 27, 2:12 PM | High | 19.5 ft |
| Tue, Oct 27, 8:43 PM | Low | -3.4 ft |
| Wed, Oct 28, 3:08 AM | High | 16.5 ft |
| Wed, Oct 28, 8:49 AM | Low | 2.5 ft |
| Wed, Oct 28, 2:52 PM | High | 19.3 ft |
| Wed, Oct 28, 9:27 PM | Low | -3.0 ft |
| Thu, Oct 29, 3:55 AM | High | 15.8 ft |
| Thu, Oct 29, 9:33 AM | Low | 3.4 ft |
| Thu, Oct 29, 3:35 PM | High | 18.6 ft |
| Thu, Oct 29, 10:15 PM | Low | -2.1 ft |
| Fri, Oct 30, 4:48 AM | High | 14.8 ft |
| Fri, Oct 30, 10:23 AM | Low | 4.5 ft |
| Fri, Oct 30, 4:25 PM | High | 17.4 ft |
| Fri, Oct 30, 11:09 PM | Low | -0.8 ft |
| Sat, Oct 31, 5:51 AM | High | 13.9 ft |
| Sat, Oct 31, 11:24 AM | Low | 5.5 ft |
| Sat, Oct 31, 5:25 PM | High | 15.9 ft |
| Sun, Nov 1, 12:13 AM | Low | 0.5 ft |
| Sun, Nov 1, 6:08 AM | High | 13.4 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| M2 | 6.5 ft | 282.5° |
| S2 | 2.2 ft | 315.0° |
| K1 | 1.7 ft | 265.4° |
| N2 | 1.3 ft | 259.3° |
| O1 | 1.0 ft | 250.1° |
| K2 | 0.6 ft | 308.0° |
| P1 | 0.5 ft | 263.4° |
| SA | 0.3 ft | 253.3° |
The eight largest of 33. Source: NOAA CO-OPS harmonic constituents for 9452210, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 12:24 the gauge read 17.3 ft, 0.8 ft below the computed curve: wind and pressure, not the moon. The widest gap of the two days was 1.5 ft, at Fri, Oct 23 23:00.
- 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 | 15.00 ft | 16.36 ft | 16.30 ft |
| Sun, Oct 25 02:00 | 14.16 ft | 15.37 ft | 15.31 ft |
| Sun, Oct 25 03:00 | 11.61 ft | 12.61 ft | 12.56 ft |
| Sun, Oct 25 04:00 | 7.82 ft | 8.75 ft | 8.72 ft |
| Sun, Oct 25 05:00 | 3.94 ft | 4.86 ft | 4.84 ft |
| Sun, Oct 25 06:00 | 1.10 ft | 2.07 ft | 2.07 ft |
| Sun, Oct 25 07:00 | 0.04 ft | 1.21 ft | 1.22 ft |
| Sun, Oct 25 08:00 | 1.43 ft | 2.63 ft | 2.65 ft |
| Sun, Oct 25 09:00 | 4.86 ft | 5.98 ft | 6.02 ft |
| Sun, Oct 25 10:00 | 9.30 ft | 10.30 ft | 10.35 ft |
| Sun, Oct 25 11:00 | 13.57 ft | 14.44 ft | 14.49 ft |
| Sun, Oct 25 12:00 | 16.55 ft | 17.40 ft | 17.46 ft |
Measured heights from NOAA CO-OPS station 9452210, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.