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OR · NOAA 9432780 · 43° 21′ N · 124° 19′ W
Tides at Charleston
A mixed, mainly semidiurnal tide (form factor 0.63), 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, 6:26 PM | Low | -0.6 ft |
| Mon, Oct 26, 12:51 AM | High | 7.0 ft |
| Mon, Oct 26, 6:17 AM | Low | 2.1 ft |
| Mon, Oct 26, 12:22 PM | High | 8.7 ft |
| Mon, Oct 26, 7:08 PM | Low | -1.2 ft |
| Tue, Oct 27, 1:40 AM | High | 7.0 ft |
| Tue, Oct 27, 6:56 AM | Low | 2.5 ft |
| Tue, Oct 27, 12:58 PM | High | 8.9 ft |
| Tue, Oct 27, 7:52 PM | Low | -1.5 ft |
| Wed, Oct 28, 2:32 AM | High | 6.9 ft |
| Wed, Oct 28, 7:37 AM | Low | 2.9 ft |
| Wed, Oct 28, 1:38 PM | High | 8.9 ft |
| Wed, Oct 28, 8:39 PM | Low | -1.5 ft |
| Thu, Oct 29, 3:26 AM | High | 6.6 ft |
| Thu, Oct 29, 8:23 AM | Low | 3.3 ft |
| Thu, Oct 29, 2:24 PM | High | 8.7 ft |
| Thu, Oct 29, 9:30 PM | Low | -1.2 ft |
| Fri, Oct 30, 4:25 AM | High | 6.4 ft |
| Fri, Oct 30, 9:15 AM | Low | 3.6 ft |
| Fri, Oct 30, 3:16 PM | High | 8.2 ft |
| Fri, Oct 30, 10:27 PM | Low | -0.8 ft |
| Sat, Oct 31, 5:28 AM | High | 6.3 ft |
| Sat, Oct 31, 10:21 AM | Low | 3.9 ft |
| Sat, Oct 31, 4:17 PM | High | 7.7 ft |
| Sat, Oct 31, 11:30 PM | Low | -0.3 ft |
| Sun, Nov 1, 5:36 AM | High | 6.3 ft |
| Sun, Nov 1, 10:44 AM | Low | 3.9 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| M2 | 2.7 ft | 225.1° |
| K1 | 1.3 ft | 235.2° |
| O1 | 0.8 ft | 220.6° |
| S2 | 0.7 ft | 250.7° |
| N2 | 0.6 ft | 200.6° |
| P1 | 0.4 ft | 233.5° |
| SA | 0.3 ft | 278.9° |
| K2 | 0.2 ft | 243.8° |
The eight largest of 32. Source: NOAA CO-OPS harmonic constituents for 9432780, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 13:24 the gauge read 7.7 ft, 0.5 ft above the computed curve: wind and pressure, not the moon. The widest gap of the two days was 0.6 ft, at Sun, Oct 25 12:18.
- 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 02:00 | 5.80 ft | 5.52 ft | 5.48 ft |
| Sun, Oct 25 03:00 | 4.52 ft | 4.17 ft | 4.13 ft |
| Sun, Oct 25 04:00 | 3.23 ft | 2.87 ft | 2.85 ft |
| Sun, Oct 25 05:00 | 2.42 ft | 2.01 ft | 2.00 ft |
| Sun, Oct 25 06:00 | 2.32 ft | 1.88 ft | 1.88 ft |
| Sun, Oct 25 07:00 | 3.04 ft | 2.56 ft | 2.58 ft |
| Sun, Oct 25 08:00 | 4.45 ft | 3.89 ft | 3.92 ft |
| Sun, Oct 25 09:00 | 6.03 ft | 5.53 ft | 5.56 ft |
| Sun, Oct 25 10:00 | 7.55 ft | 7.05 ft | 7.09 ft |
| Sun, Oct 25 11:00 | 8.63 ft | 8.09 ft | 8.13 ft |
| Sun, Oct 25 12:00 | 8.92 ft | 8.37 ft | 8.41 ft |
| Sun, Oct 25 13:00 | 8.25 ft | 7.72 ft | 7.77 ft |
Measured heights from NOAA CO-OPS station 9432780, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.