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AL · NOAA 8735180 · 30° 15′ N · 88° 05′ W
Tides at Dauphin Island
A diurnal tide (form factor 11.68), spring this week. Predicted from the station's 27 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, 9:49 PM | High | 1.6 ft |
| Mon, Oct 26, 8:36 AM | Low | 0.2 ft |
| Mon, Oct 26, 10:27 PM | High | 1.8 ft |
| Tue, Oct 27, 9:49 AM | Low | 0.0 ft |
| Tue, Oct 27, 11:14 PM | High | 1.9 ft |
| Wed, Oct 28, 11:01 AM | Low | -0.1 ft |
| Thu, Oct 29, 12:09 AM | High | 2.0 ft |
| Thu, Oct 29, 12:12 PM | Low | -0.2 ft |
| Fri, Oct 30, 1:07 AM | High | 2.0 ft |
| Fri, Oct 30, 1:20 PM | Low | -0.2 ft |
| Sat, Oct 31, 2:04 AM | High | 1.9 ft |
| Sat, Oct 31, 2:25 PM | Low | -0.1 ft |
| Sun, Nov 1, 1:59 AM | High | 1.8 ft |
| Sun, Nov 1, 2:20 PM | Low | -0.0 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| K1 | 0.4 ft | 48.6° |
| O1 | 0.4 ft | 39.5° |
| SA | 0.3 ft | 149.5° |
| SSA | 0.2 ft | 51.4° |
| P1 | 0.1 ft | 49.8° |
| Q1 | 0.1 ft | 27.9° |
| M2 | 0.0 ft | 129.4° |
| S2 | 0.0 ft | 128.0° |
The eight largest of 27. Source: NOAA CO-OPS harmonic constituents for 8735180, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 15:24 the gauge read 1.6 ft, 0.7 ft above the computed curve: wind and pressure, not the moon. The widest gap of the two days was 0.8 ft, at Fri, Oct 23 15:48.
- 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 04:00 | 1.23 ft | 0.58 ft | 0.60 ft |
| Sun, Oct 25 05:00 | 1.10 ft | 0.47 ft | 0.48 ft |
| Sun, Oct 25 06:00 | 1.08 ft | 0.39 ft | 0.41 ft |
| Sun, Oct 25 07:00 | 1.06 ft | 0.36 ft | 0.36 ft |
| Sun, Oct 25 08:00 | 1.04 ft | 0.36 ft | 0.36 ft |
| Sun, Oct 25 09:00 | 1.05 ft | 0.40 ft | 0.39 ft |
| Sun, Oct 25 10:00 | 1.10 ft | 0.47 ft | 0.46 ft |
| Sun, Oct 25 11:00 | 1.10 ft | 0.55 ft | 0.54 ft |
| Sun, Oct 25 12:00 | 1.14 ft | 0.64 ft | 0.62 ft |
| Sun, Oct 25 13:00 | 1.33 ft | 0.73 ft | 0.71 ft |
| Sun, Oct 25 14:00 | 1.51 ft | 0.81 ft | 0.79 ft |
| Sun, Oct 25 15:00 | 1.63 ft | 0.91 ft | 0.89 ft |
Measured heights from NOAA CO-OPS station 8735180, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.