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NC · NOAA 8651370 · 36° 11′ N · 75° 45′ W
Tides at Duck
A mixed, mainly semidiurnal tide (form factor 0.25), spring this week. Predicted from the station's 32 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, 7:26 PM | High | 3.7 ft |
| Mon, Oct 26, 1:27 AM | Low | 0.1 ft |
| Mon, Oct 26, 7:50 AM | High | 4.6 ft |
| Mon, Oct 26, 2:16 PM | Low | 0.1 ft |
| Mon, Oct 26, 8:11 PM | High | 3.6 ft |
| Tue, Oct 27, 2:10 AM | Low | -0.0 ft |
| Tue, Oct 27, 8:36 AM | High | 4.7 ft |
| Tue, Oct 27, 3:02 PM | Low | 0.1 ft |
| Tue, Oct 27, 8:58 PM | High | 3.6 ft |
| Wed, Oct 28, 2:55 AM | Low | 0.0 ft |
| Wed, Oct 28, 9:24 AM | High | 4.7 ft |
| Wed, Oct 28, 3:53 PM | Low | 0.2 ft |
| Wed, Oct 28, 9:48 PM | High | 3.5 ft |
| Thu, Oct 29, 3:45 AM | Low | 0.1 ft |
| Thu, Oct 29, 10:16 AM | High | 4.6 ft |
| Thu, Oct 29, 4:50 PM | Low | 0.3 ft |
| Thu, Oct 29, 10:44 PM | High | 3.4 ft |
| Fri, Oct 30, 4:41 AM | Low | 0.3 ft |
| Fri, Oct 30, 11:13 AM | High | 4.4 ft |
| Fri, Oct 30, 5:51 PM | Low | 0.4 ft |
| Fri, Oct 30, 11:42 PM | High | 3.3 ft |
| Sat, Oct 31, 5:44 AM | Low | 0.4 ft |
| Sat, Oct 31, 12:11 PM | High | 4.2 ft |
| Sat, Oct 31, 6:54 PM | Low | 0.5 ft |
| Sun, Nov 1, 12:45 AM | High | 3.2 ft |
| Sun, Nov 1, 5:52 AM | Low | 0.6 ft |
| Sun, Nov 1, 12:13 PM | High | 3.9 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| M2 | 1.6 ft | 358.0° |
| N2 | 0.4 ft | 338.5° |
| SA | 0.3 ft | 170.0° |
| S2 | 0.3 ft | 22.1° |
| K1 | 0.3 ft | 172.9° |
| O1 | 0.2 ft | 190.9° |
| SSA | 0.2 ft | 44.1° |
| P1 | 0.1 ft | 171.8° |
The eight largest of 32. Source: NOAA CO-OPS harmonic constituents for 8651370, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 16:24 the gauge read 2.7 ft, 0.9 ft above the computed curve: wind and pressure, not the moon. The widest gap of the two days was 2.1 ft, at Fri, Oct 23 21:24.
- 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 | 4.45 ft | 3.32 ft | 3.31 ft |
| Sun, Oct 25 06:00 | 5.20 ft | 4.08 ft | 4.08 ft |
| Sun, Oct 25 07:00 | 5.41 ft | 4.39 ft | 4.39 ft |
| Sun, Oct 25 08:00 | 5.29 ft | 4.21 ft | 4.22 ft |
| Sun, Oct 25 09:00 | 4.89 ft | 3.63 ft | 3.64 ft |
| Sun, Oct 25 10:00 | 3.94 ft | 2.74 ft | 2.75 ft |
| Sun, Oct 25 11:00 | 2.94 ft | 1.72 ft | 1.73 ft |
| Sun, Oct 25 12:00 | 1.82 ft | 0.81 ft | 0.83 ft |
| Sun, Oct 25 13:00 | 1.30 ft | 0.30 ft | 0.31 ft |
| Sun, Oct 25 14:00 | 1.29 ft | 0.29 ft | 0.30 ft |
| Sun, Oct 25 15:00 | 1.67 ft | 0.72 ft | 0.73 ft |
| Sun, Oct 25 16:00 | 2.29 ft | 1.46 ft | 1.47 ft |
Measured heights from NOAA CO-OPS station 8651370, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.