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VA · NOAA 8638610 · 36° 57′ N · 76° 20′ W
Tides at Sewells Point
A semidiurnal tide (form factor 0.22), 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, 9:11 PM | High | 2.8 ft |
| Mon, Oct 26, 3:13 AM | Low | 0.1 ft |
| Mon, Oct 26, 9:33 AM | High | 3.4 ft |
| Mon, Oct 26, 4:06 PM | Low | 0.2 ft |
| Mon, Oct 26, 9:57 PM | High | 2.8 ft |
| Tue, Oct 27, 3:57 AM | Low | 0.1 ft |
| Tue, Oct 27, 10:19 AM | High | 3.5 ft |
| Tue, Oct 27, 4:53 PM | Low | 0.2 ft |
| Tue, Oct 27, 10:43 PM | High | 2.7 ft |
| Wed, Oct 28, 4:42 AM | Low | 0.1 ft |
| Wed, Oct 28, 11:07 AM | High | 3.4 ft |
| Wed, Oct 28, 5:42 PM | Low | 0.2 ft |
| Wed, Oct 28, 11:32 PM | High | 2.7 ft |
| Thu, Oct 29, 5:30 AM | Low | 0.1 ft |
| Thu, Oct 29, 11:58 AM | High | 3.4 ft |
| Thu, Oct 29, 6:37 PM | Low | 0.3 ft |
| Fri, Oct 30, 12:26 AM | High | 2.6 ft |
| Fri, Oct 30, 6:24 AM | Low | 0.2 ft |
| Fri, Oct 30, 12:55 PM | High | 3.2 ft |
| Fri, Oct 30, 7:38 PM | Low | 0.4 ft |
| Sat, Oct 31, 1:25 AM | High | 2.5 ft |
| Sat, Oct 31, 7:28 AM | Low | 0.3 ft |
| Sat, Oct 31, 1:55 PM | High | 3.1 ft |
| Sat, Oct 31, 8:42 PM | Low | 0.5 ft |
| Sun, Nov 1, 1:29 AM | High | 2.5 ft |
| Sun, Nov 1, 7:38 AM | Low | 0.5 ft |
| Sun, Nov 1, 1:58 PM | High | 2.9 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| M2 | 1.1 ft | 47.1° |
| SA | 0.3 ft | 150.1° |
| N2 | 0.3 ft | 27.5° |
| S2 | 0.2 ft | 76.2° |
| SSA | 0.2 ft | 45.4° |
| K1 | 0.2 ft | 199.8° |
| O1 | 0.1 ft | 223.8° |
| K2 | 0.1 ft | 71.8° |
The eight largest of 34. Source: NOAA CO-OPS harmonic constituents for 8638610, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 16:24 the gauge read 1.4 ft, 0.9 ft above the computed curve: wind and pressure, not the moon. The widest gap of the two days was 1.9 ft, at Fri, Oct 23 22:24.
- 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 | 2.43 ft | 1.26 ft | 1.25 ft |
| Sun, Oct 25 06:00 | 3.13 ft | 2.01 ft | 2.00 ft |
| Sun, Oct 25 07:00 | 3.78 ft | 2.69 ft | 2.69 ft |
| Sun, Oct 25 08:00 | 4.22 ft | 3.14 ft | 3.14 ft |
| Sun, Oct 25 09:00 | 4.38 ft | 3.25 ft | 3.26 ft |
| Sun, Oct 25 10:00 | 4.17 ft | 3.04 ft | 3.05 ft |
| Sun, Oct 25 11:00 | 3.71 ft | 2.56 ft | 2.56 ft |
| Sun, Oct 25 12:00 | 3.02 ft | 1.87 ft | 1.88 ft |
| Sun, Oct 25 13:00 | 2.26 ft | 1.15 ft | 1.16 ft |
| Sun, Oct 25 14:00 | 1.61 ft | 0.58 ft | 0.59 ft |
| Sun, Oct 25 15:00 | 1.26 ft | 0.29 ft | 0.30 ft |
| Sun, Oct 25 16:00 | 1.28 ft | 0.35 ft | 0.36 ft |
Measured heights from NOAA CO-OPS station 8638610, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.