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FL · NOAA 8720218 · 30° 24′ N · 81° 26′ W
Tides at Mayport (Bar Pilots Dock)
A semidiurnal tide (form factor 0.18), 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 |
|---|---|---|
| Wed, Oct 28, 3:58 AM | Low | 0.1 ft |
| Wed, Oct 28, 10:47 AM | High | 6.2 ft |
| Wed, Oct 28, 4:48 PM | Low | 0.5 ft |
| Wed, Oct 28, 11:12 PM | High | 5.1 ft |
| Thu, Oct 29, 4:47 AM | Low | 0.2 ft |
| Thu, Oct 29, 11:40 AM | High | 6.1 ft |
| Thu, Oct 29, 5:43 PM | Low | 0.7 ft |
| Fri, Oct 30, 12:07 AM | High | 5.0 ft |
| Fri, Oct 30, 5:42 AM | Low | 0.5 ft |
| Fri, Oct 30, 12:37 PM | High | 5.9 ft |
| Fri, Oct 30, 6:44 PM | Low | 0.9 ft |
| Sat, Oct 31, 1:05 AM | High | 4.8 ft |
| Sat, Oct 31, 6:46 AM | Low | 0.7 ft |
| Sat, Oct 31, 1:37 PM | High | 5.7 ft |
| Sat, Oct 31, 7:50 PM | Low | 1.0 ft |
| Sun, Nov 1, 1:09 AM | High | 4.8 ft |
| Sun, Nov 1, 6:57 AM | Low | 0.8 ft |
| Sun, Nov 1, 1:41 PM | High | 5.5 ft |
| Sun, Nov 1, 7:54 PM | Low | 1.0 ft |
| Mon, Nov 2, 2:17 AM | High | 4.8 ft |
| Mon, Nov 2, 8:08 AM | Low | 0.9 ft |
| Mon, Nov 2, 2:47 PM | High | 5.4 ft |
| Mon, Nov 2, 8:54 PM | Low | 0.9 ft |
| Tue, Nov 3, 3:25 AM | High | 5.0 ft |
| Tue, Nov 3, 9:14 AM | Low | 0.9 ft |
| Tue, Nov 3, 3:51 PM | High | 5.3 ft |
| Tue, Nov 3, 9:50 PM | Low | 0.8 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| M2 | 2.2 ft | 26.4° |
| N2 | 0.5 ft | 8.2° |
| SA | 0.4 ft | 188.2° |
| S2 | 0.3 ft | 49.9° |
| SSA | 0.3 ft | 52.8° |
| K1 | 0.3 ft | 204.3° |
| O1 | 0.2 ft | 211.0° |
| M4 | 0.1 ft | 163.8° |
The eight largest of 33. Source: NOAA CO-OPS harmonic constituents for 8720218, public domain.
The year as a print
The last two days, measured
At Tue, Oct 27 23:18 the gauge read 6.2 ft, 1.3 ft above the computed curve: wind and pressure, not the moon. The widest gap of the two days was 2.2 ft, at Mon, Oct 26 00:42.
- 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 |
|---|---|---|---|
| Tue, Oct 27 12:00 | 6.27 ft | 4.83 ft | 4.83 ft |
| Tue, Oct 27 13:00 | 4.78 ft | 3.31 ft | 3.32 ft |
| Tue, Oct 27 14:00 | 3.25 ft | 1.80 ft | 1.81 ft |
| Tue, Oct 27 15:00 | 2.19 ft | 0.78 ft | 0.79 ft |
| Tue, Oct 27 16:00 | 1.56 ft | 0.44 ft | 0.45 ft |
| Tue, Oct 27 17:00 | 1.72 ft | 0.80 ft | 0.81 ft |
| Tue, Oct 27 18:00 | 2.65 ft | 1.71 ft | 1.72 ft |
| Tue, Oct 27 19:00 | 3.83 ft | 2.86 ft | 2.87 ft |
| Tue, Oct 27 20:00 | 4.85 ft | 3.92 ft | 3.93 ft |
| Tue, Oct 27 21:00 | 5.64 ft | 4.73 ft | 4.74 ft |
| Tue, Oct 27 22:00 | 6.21 ft | 5.16 ft | 5.16 ft |
| Tue, Oct 27 23:00 | 6.33 ft | 5.07 ft | 5.07 ft |
Measured heights from NOAA CO-OPS station 8720218, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.