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NC · NOAA 8658120 · 34° 14′ N · 77° 57′ W
Tides at Wilmington
A semidiurnal tide (form factor 0.21), spring this week. Predicted from the station's 34 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, 9:35 PM | High | 4.8 ft |
| Mon, Oct 26, 4:12 AM | Low | 0.1 ft |
| Mon, Oct 26, 9:55 AM | High | 5.4 ft |
| Mon, Oct 26, 5:02 PM | Low | 0.2 ft |
| Mon, Oct 26, 10:18 PM | High | 4.7 ft |
| Tue, Oct 27, 4:59 AM | Low | 0.0 ft |
| Tue, Oct 27, 10:37 AM | High | 5.4 ft |
| Tue, Oct 27, 5:54 PM | Low | 0.2 ft |
| Tue, Oct 27, 11:04 PM | High | 4.6 ft |
| Wed, Oct 28, 5:48 AM | Low | -0.0 ft |
| Wed, Oct 28, 11:26 AM | High | 5.4 ft |
| Wed, Oct 28, 6:46 PM | Low | 0.3 ft |
| Wed, Oct 28, 11:57 PM | High | 4.4 ft |
| Thu, Oct 29, 6:37 AM | Low | 0.0 ft |
| Thu, Oct 29, 12:25 PM | High | 5.3 ft |
| Thu, Oct 29, 7:38 PM | Low | 0.4 ft |
| Fri, Oct 30, 12:59 AM | High | 4.3 ft |
| Fri, Oct 30, 7:29 AM | Low | 0.1 ft |
| Fri, Oct 30, 1:36 PM | High | 5.1 ft |
| Fri, Oct 30, 8:33 PM | Low | 0.5 ft |
| Sat, Oct 31, 2:07 AM | High | 4.3 ft |
| Sat, Oct 31, 8:27 AM | Low | 0.3 ft |
| Sat, Oct 31, 2:47 PM | High | 5.0 ft |
| Sat, Oct 31, 9:32 PM | Low | 0.6 ft |
| Sun, Nov 1, 2:14 AM | High | 4.3 ft |
| Sun, Nov 1, 8:31 AM | Low | 0.4 ft |
| Sun, Nov 1, 2:53 PM | High | 4.9 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| M2 | 2.1 ft | 59.5° |
| N2 | 0.4 ft | 49.1° |
| SA | 0.3 ft | 158.4° |
| K1 | 0.3 ft | 227.2° |
| S2 | 0.3 ft | 96.2° |
| O1 | 0.2 ft | 231.6° |
| SSA | 0.2 ft | 56.1° |
| M4 | 0.2 ft | 344.0° |
The eight largest of 34. Source: NOAA CO-OPS harmonic constituents for 8658120, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 16:24 the gauge read 0.9 ft, 0.5 ft above the computed curve: wind and pressure, not the moon. The widest gap of the two days was 1.3 ft, at Sat, Oct 24 12:48.
- 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 05:00 | 1.85 ft | 1.28 ft | 1.26 ft |
| Sun, Oct 25 06:00 | 3.58 ft | 2.84 ft | 2.83 ft |
| Sun, Oct 25 07:00 | 4.53 ft | 4.20 ft | 4.19 ft |
| Sun, Oct 25 08:00 | 5.21 ft | 4.94 ft | 4.93 ft |
| Sun, Oct 25 09:00 | 5.75 ft | 5.21 ft | 5.21 ft |
| Sun, Oct 25 10:00 | 5.85 ft | 5.10 ft | 5.10 ft |
| Sun, Oct 25 11:00 | 5.30 ft | 4.53 ft | 4.53 ft |
| Sun, Oct 25 12:00 | 4.39 ft | 3.60 ft | 3.61 ft |
| Sun, Oct 25 13:00 | 3.38 ft | 2.57 ft | 2.58 ft |
| Sun, Oct 25 14:00 | 2.43 ft | 1.60 ft | 1.62 ft |
| Sun, Oct 25 15:00 | 1.59 ft | 0.79 ft | 0.81 ft |
| Sun, Oct 25 16:00 | 0.97 ft | 0.34 ft | 0.35 ft |
Measured heights from NOAA CO-OPS station 8658120, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.