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FL · NOAA 8726520 · 27° 46′ N · 82° 38′ W
Tides at St. Petersburg
A mixed, mainly semidiurnal tide (form factor 1.41), 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, 7:48 PM | Low | 1.4 ft |
| Mon, Oct 26, 1:31 AM | High | 2.7 ft |
| Mon, Oct 26, 8:59 AM | Low | -0.0 ft |
| Mon, Oct 26, 3:53 PM | High | 1.9 ft |
| Mon, Oct 26, 8:03 PM | Low | 1.6 ft |
| Tue, Oct 27, 1:56 AM | High | 2.8 ft |
| Tue, Oct 27, 9:47 AM | Low | -0.2 ft |
| Tue, Oct 27, 5:05 PM | High | 1.8 ft |
| Tue, Oct 27, 8:12 PM | Low | 1.7 ft |
| Wed, Oct 28, 2:28 AM | High | 2.9 ft |
| Wed, Oct 28, 10:39 AM | Low | -0.3 ft |
| Wed, Oct 28, 6:46 PM | High | 1.7 ft |
| Wed, Oct 28, 8:06 PM | Low | 1.7 ft |
| Thu, Oct 29, 3:06 AM | High | 3.0 ft |
| Thu, Oct 29, 11:36 AM | Low | -0.3 ft |
| Fri, Oct 30, 3:53 AM | High | 2.9 ft |
| Fri, Oct 30, 12:39 PM | Low | -0.2 ft |
| Sat, Oct 31, 4:52 AM | High | 2.7 ft |
| Sat, Oct 31, 1:48 PM | Low | -0.0 ft |
| Sun, Nov 1, 5:10 AM | High | 2.5 ft |
| Sun, Nov 1, 1:58 PM | Low | 0.1 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| M2 | 0.5 ft | 199.4° |
| K1 | 0.5 ft | 49.8° |
| O1 | 0.5 ft | 36.6° |
| SA | 0.3 ft | 152.9° |
| S2 | 0.2 ft | 214.8° |
| P1 | 0.2 ft | 58.5° |
| SSA | 0.1 ft | 55.0° |
| N2 | 0.1 ft | 190.4° |
The eight largest of 34. Source: NOAA CO-OPS harmonic constituents for 8726520, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 16:24 the gauge read 2.1 ft, 0.2 ft above the computed curve: wind and pressure, not the moon. The widest gap of the two days was 0.7 ft, at Fri, Oct 23 16:36.
- 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 | 1.45 ft | 1.22 ft | 1.24 ft |
| Sun, Oct 25 06:00 | 1.01 ft | 0.74 ft | 0.76 ft |
| Sun, Oct 25 07:00 | 0.65 ft | 0.37 ft | 0.39 ft |
| Sun, Oct 25 08:00 | 0.51 ft | 0.19 ft | 0.20 ft |
| Sun, Oct 25 09:00 | 0.65 ft | 0.26 ft | 0.26 ft |
| Sun, Oct 25 10:00 | 0.96 ft | 0.54 ft | 0.54 ft |
| Sun, Oct 25 11:00 | 1.30 ft | 0.94 ft | 0.94 ft |
| Sun, Oct 25 12:00 | 1.70 ft | 1.38 ft | 1.37 ft |
| Sun, Oct 25 13:00 | 1.98 ft | 1.76 ft | 1.75 ft |
| Sun, Oct 25 14:00 | 2.17 ft | 2.00 ft | 1.98 ft |
| Sun, Oct 25 15:00 | 2.21 ft | 2.06 ft | 2.04 ft |
| Sun, Oct 25 16:00 | 2.08 ft | 1.98 ft | 1.96 ft |
Measured heights from NOAA CO-OPS station 8726520, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.