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FL · NOAA 8723214 · 25° 44′ N · 80° 10′ W
Tides at Virginia Key
A semidiurnal tide (form factor 0.17), 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, 9:03 PM | High | 2.8 ft |
| Mon, Oct 26, 3:12 AM | Low | 0.2 ft |
| Mon, Oct 26, 9:44 AM | High | 3.0 ft |
| Mon, Oct 26, 3:41 PM | Low | 0.6 ft |
| Mon, Oct 26, 9:48 PM | High | 2.8 ft |
| Tue, Oct 27, 3:58 AM | Low | 0.2 ft |
| Tue, Oct 27, 10:31 AM | High | 3.0 ft |
| Tue, Oct 27, 4:27 PM | Low | 0.6 ft |
| Tue, Oct 27, 10:34 PM | High | 2.8 ft |
| Wed, Oct 28, 4:44 AM | Low | 0.2 ft |
| Wed, Oct 28, 11:19 AM | High | 2.9 ft |
| Wed, Oct 28, 5:15 PM | Low | 0.6 ft |
| Wed, Oct 28, 11:22 PM | High | 2.8 ft |
| Thu, Oct 29, 5:35 AM | Low | 0.2 ft |
| Thu, Oct 29, 12:11 PM | High | 2.9 ft |
| Thu, Oct 29, 6:08 PM | Low | 0.7 ft |
| Fri, Oct 30, 12:16 AM | High | 2.7 ft |
| Fri, Oct 30, 6:33 AM | Low | 0.3 ft |
| Fri, Oct 30, 1:06 PM | High | 2.8 ft |
| Fri, Oct 30, 7:09 PM | Low | 0.8 ft |
| Sat, Oct 31, 1:16 AM | High | 2.6 ft |
| Sat, Oct 31, 7:38 AM | Low | 0.4 ft |
| Sat, Oct 31, 2:04 PM | High | 2.7 ft |
| Sat, Oct 31, 8:14 PM | Low | 0.8 ft |
| Sun, Nov 1, 1:20 AM | High | 2.6 ft |
| Sun, Nov 1, 7:44 AM | Low | 0.5 ft |
| Sun, Nov 1, 2:03 PM | High | 2.6 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| M2 | 1.0 ft | 39.3° |
| SA | 0.3 ft | 194.1° |
| N2 | 0.2 ft | 21.2° |
| SSA | 0.2 ft | 60.5° |
| S2 | 0.2 ft | 70.0° |
| K1 | 0.1 ft | 262.5° |
| O1 | 0.1 ft | 290.0° |
| K2 | 0.0 ft | 68.2° |
The eight largest of 34. Source: NOAA CO-OPS harmonic constituents for 8723214, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 16:24 the gauge read 2.3 ft, 1.4 ft above the computed curve: wind and pressure, not the moon. The widest gap of the two days was 1.5 ft, at Sun, Oct 25 08:54.
- 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 | 2.57 ft | 1.22 ft | 1.21 ft |
| Sun, Oct 25 06:00 | 3.20 ft | 1.81 ft | 1.81 ft |
| Sun, Oct 25 07:00 | 3.75 ft | 2.34 ft | 2.34 ft |
| Sun, Oct 25 08:00 | 4.19 ft | 2.74 ft | 2.73 ft |
| Sun, Oct 25 09:00 | 4.41 ft | 2.89 ft | 2.89 ft |
| Sun, Oct 25 10:00 | 4.08 ft | 2.68 ft | 2.68 ft |
| Sun, Oct 25 11:00 | 3.49 ft | 2.16 ft | 2.16 ft |
| Sun, Oct 25 12:00 | 2.93 ft | 1.58 ft | 1.58 ft |
| Sun, Oct 25 13:00 | 2.43 ft | 1.08 ft | 1.08 ft |
| Sun, Oct 25 14:00 | 1.96 ft | 0.73 ft | 0.73 ft |
| Sun, Oct 25 15:00 | 1.85 ft | 0.61 ft | 0.61 ft |
| Sun, Oct 25 16:00 | 2.10 ft | 0.77 ft | 0.77 ft |
Measured heights from NOAA CO-OPS station 8723214, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.