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SC · NOAA 8665530 · 32° 47′ N · 79° 55′ W
Tides at Charleston
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, 7:56 PM | High | 5.8 ft |
| Mon, Oct 26, 2:06 AM | Low | 0.1 ft |
| Mon, Oct 26, 8:17 AM | High | 6.8 ft |
| Mon, Oct 26, 2:50 PM | Low | 0.3 ft |
| Mon, Oct 26, 8:41 PM | High | 5.8 ft |
| Tue, Oct 27, 2:53 AM | Low | -0.1 ft |
| Tue, Oct 27, 9:05 AM | High | 6.9 ft |
| Tue, Oct 27, 3:41 PM | Low | 0.3 ft |
| Tue, Oct 27, 9:30 PM | High | 5.7 ft |
| Wed, Oct 28, 3:41 AM | Low | -0.1 ft |
| Wed, Oct 28, 9:56 AM | High | 6.8 ft |
| Wed, Oct 28, 4:32 PM | Low | 0.4 ft |
| Wed, Oct 28, 10:23 PM | High | 5.5 ft |
| Thu, Oct 29, 4:31 AM | Low | 0.0 ft |
| Thu, Oct 29, 10:51 AM | High | 6.7 ft |
| Thu, Oct 29, 5:26 PM | Low | 0.6 ft |
| Thu, Oct 29, 11:21 PM | High | 5.3 ft |
| Fri, Oct 30, 5:25 AM | Low | 0.2 ft |
| Fri, Oct 30, 11:52 AM | High | 6.5 ft |
| Fri, Oct 30, 6:23 PM | Low | 0.7 ft |
| Sat, Oct 31, 12:25 AM | High | 5.2 ft |
| Sat, Oct 31, 6:24 AM | Low | 0.4 ft |
| Sat, Oct 31, 12:57 PM | High | 6.3 ft |
| Sat, Oct 31, 7:26 PM | Low | 0.9 ft |
| Sun, Nov 1, 1:33 AM | High | 5.2 ft |
| Sun, Nov 1, 6:30 AM | Low | 0.6 ft |
| Sun, Nov 1, 1:03 PM | High | 6.1 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| M2 | 2.5 ft | 10.1° |
| N2 | 0.6 ft | 354.9° |
| S2 | 0.4 ft | 36.0° |
| K1 | 0.3 ft | 198.4° |
| SA | 0.3 ft | 173.2° |
| O1 | 0.3 ft | 202.0° |
| SSA | 0.2 ft | 49.2° |
| L2 | 0.1 ft | 3.5° |
The eight largest of 34. Source: NOAA CO-OPS harmonic constituents for 8665530, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 16:24 the gauge read 3.3 ft, 0.8 ft above the computed curve: wind and pressure, not the moon. The widest gap of the two days was 2.2 ft, at Sat, Oct 24 11:24.
- 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 | 5.50 ft | 4.58 ft | 4.58 ft |
| Sun, Oct 25 06:00 | 6.60 ft | 5.80 ft | 5.80 ft |
| Sun, Oct 25 07:00 | 7.39 ft | 6.43 ft | 6.43 ft |
| Sun, Oct 25 08:00 | 7.82 ft | 6.46 ft | 6.46 ft |
| Sun, Oct 25 09:00 | 7.49 ft | 5.90 ft | 5.91 ft |
| Sun, Oct 25 10:00 | 6.42 ft | 4.80 ft | 4.81 ft |
| Sun, Oct 25 11:00 | 5.17 ft | 3.38 ft | 3.39 ft |
| Sun, Oct 25 12:00 | 3.87 ft | 1.94 ft | 1.96 ft |
| Sun, Oct 25 13:00 | 2.67 ft | 0.85 ft | 0.87 ft |
| Sun, Oct 25 14:00 | 1.99 ft | 0.43 ft | 0.45 ft |
| Sun, Oct 25 15:00 | 1.99 ft | 0.85 ft | 0.86 ft |
| Sun, Oct 25 16:00 | 2.84 ft | 1.99 ft | 2.01 ft |
Measured heights from NOAA CO-OPS station 8665530, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.