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NY · NOAA 8518750 · 40° 42′ N · 74° 01′ W
Tides at The Battery
A semidiurnal tide (form factor 0.19), 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, 8:13 PM | High | 5.1 ft |
| Mon, Oct 26, 2:32 AM | Low | -0.1 ft |
| Mon, Oct 26, 8:26 AM | High | 6.0 ft |
| Mon, Oct 26, 3:18 PM | Low | -0.2 ft |
| Mon, Oct 26, 8:56 PM | High | 5.1 ft |
| Tue, Oct 27, 3:16 AM | Low | -0.1 ft |
| Tue, Oct 27, 9:08 AM | High | 6.1 ft |
| Tue, Oct 27, 4:07 PM | Low | -0.3 ft |
| Tue, Oct 27, 9:43 PM | High | 4.9 ft |
| Wed, Oct 28, 4:02 AM | Low | -0.1 ft |
| Wed, Oct 28, 9:54 AM | High | 6.0 ft |
| Wed, Oct 28, 4:56 PM | Low | -0.2 ft |
| Wed, Oct 28, 10:36 PM | High | 4.8 ft |
| Thu, Oct 29, 4:49 AM | Low | 0.0 ft |
| Thu, Oct 29, 10:49 AM | High | 5.8 ft |
| Thu, Oct 29, 5:47 PM | Low | -0.0 ft |
| Thu, Oct 29, 11:39 PM | High | 4.6 ft |
| Fri, Oct 30, 5:40 AM | Low | 0.3 ft |
| Fri, Oct 30, 11:53 AM | High | 5.6 ft |
| Fri, Oct 30, 6:44 PM | Low | 0.2 ft |
| Sat, Oct 31, 12:48 AM | High | 4.5 ft |
| Sat, Oct 31, 6:40 AM | Low | 0.5 ft |
| Sat, Oct 31, 1:03 PM | High | 5.3 ft |
| Sat, Oct 31, 7:50 PM | Low | 0.4 ft |
| Sun, Nov 1, 1:55 AM | High | 4.5 ft |
| Sun, Nov 1, 6:53 AM | Low | 0.8 ft |
| Sun, Nov 1, 1:09 PM | High | 5.1 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| M2 | 2.2 ft | 18.2° |
| N2 | 0.5 ft | 0.5° |
| S2 | 0.4 ft | 42.9° |
| K1 | 0.3 ft | 178.5° |
| SA | 0.3 ft | 144.6° |
| O1 | 0.2 ft | 176.3° |
| K2 | 0.1 ft | 44.5° |
| P1 | 0.1 ft | 178.8° |
The eight largest of 34. Source: NOAA CO-OPS harmonic constituents for 8518750, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 16:24 the gauge read 1.7 ft, 0.3 ft above the computed curve: wind and pressure, not the moon. The widest gap of the two days was 1.4 ft, at Fri, Oct 23 21:12.
- 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 | 3.92 ft | 3.47 ft | 3.46 ft |
| Sun, Oct 25 06:00 | 5.08 ft | 4.78 ft | 4.77 ft |
| Sun, Oct 25 07:00 | 5.65 ft | 5.54 ft | 5.53 ft |
| Sun, Oct 25 08:00 | 5.93 ft | 5.72 ft | 5.72 ft |
| Sun, Oct 25 09:00 | 5.70 ft | 5.30 ft | 5.30 ft |
| Sun, Oct 25 10:00 | 4.81 ft | 4.31 ft | 4.32 ft |
| Sun, Oct 25 11:00 | 3.36 ft | 2.97 ft | 2.98 ft |
| Sun, Oct 25 12:00 | 2.10 ft | 1.68 ft | 1.69 ft |
| Sun, Oct 25 13:00 | 1.01 ft | 0.68 ft | 0.70 ft |
| Sun, Oct 25 14:00 | 0.23 ft | 0.08 ft | 0.09 ft |
| Sun, Oct 25 15:00 | 0.09 ft | 0.08 ft | 0.10 ft |
| Sun, Oct 25 16:00 | 1.09 ft | 0.92 ft | 0.93 ft |
Measured heights from NOAA CO-OPS station 8518750, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.