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CA · NOAA 9410170 · 32° 43′ N · 117° 11′ W
Tides at San Diego
A mixed, mainly semidiurnal tide (form factor 0.72), 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, 3:29 PM | Low | -0.4 ft |
| Sun, Oct 25, 9:38 PM | High | 4.9 ft |
| Mon, Oct 26, 3:04 AM | Low | 1.4 ft |
| Mon, Oct 26, 9:17 AM | High | 6.9 ft |
| Mon, Oct 26, 4:12 PM | Low | -0.7 ft |
| Mon, Oct 26, 10:25 PM | High | 4.6 ft |
| Tue, Oct 27, 3:34 AM | Low | 1.8 ft |
| Tue, Oct 27, 9:50 AM | High | 7.1 ft |
| Tue, Oct 27, 4:59 PM | Low | -0.8 ft |
| Tue, Oct 27, 11:18 PM | High | 4.3 ft |
| Wed, Oct 28, 4:06 AM | Low | 2.2 ft |
| Wed, Oct 28, 10:28 AM | High | 7.0 ft |
| Wed, Oct 28, 5:52 PM | Low | -0.7 ft |
| Thu, Oct 29, 12:22 AM | High | 3.9 ft |
| Thu, Oct 29, 4:42 AM | Low | 2.6 ft |
| Thu, Oct 29, 11:12 AM | High | 6.7 ft |
| Thu, Oct 29, 6:53 PM | Low | -0.4 ft |
| Fri, Oct 30, 1:41 AM | High | 3.7 ft |
| Fri, Oct 30, 5:28 AM | Low | 3.0 ft |
| Fri, Oct 30, 12:08 PM | High | 6.2 ft |
| Fri, Oct 30, 8:03 PM | Low | -0.1 ft |
| Sat, Oct 31, 3:20 AM | High | 3.7 ft |
| Sat, Oct 31, 6:51 AM | Low | 3.3 ft |
| Sat, Oct 31, 1:22 PM | High | 5.7 ft |
| Sat, Oct 31, 9:22 PM | Low | 0.1 ft |
| Sun, Nov 1, 3:52 AM | High | 4.1 ft |
| Sun, Nov 1, 8:02 AM | Low | 3.4 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| M2 | 1.8 ft | 143.3° |
| K1 | 1.1 ft | 208.4° |
| S2 | 0.7 ft | 140.4° |
| O1 | 0.7 ft | 192.6° |
| N2 | 0.4 ft | 123.1° |
| P1 | 0.3 ft | 205.9° |
| SA | 0.2 ft | 180.5° |
| K2 | 0.2 ft | 134.5° |
The eight largest of 32. Source: NOAA CO-OPS harmonic constituents for 9410170, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 13:24 the gauge read 2.6 ft, 1.5 ft above the computed curve: wind and pressure, not the moon. The widest gap of the two days was 1.6 ft, at Sun, Oct 25 12:30.
- 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 | 2.63 ft | 1.24 ft | 1.22 ft |
| Sun, Oct 25 03:00 | 2.58 ft | 1.18 ft | 1.18 ft |
| Sun, Oct 25 04:00 | 3.23 ft | 1.77 ft | 1.78 ft |
| Sun, Oct 25 05:00 | 4.43 ft | 2.90 ft | 2.91 ft |
| Sun, Oct 25 06:00 | 5.82 ft | 4.26 ft | 4.29 ft |
| Sun, Oct 25 07:00 | 7.00 ft | 5.53 ft | 5.57 ft |
| Sun, Oct 25 08:00 | 7.93 ft | 6.40 ft | 6.44 ft |
| Sun, Oct 25 09:00 | 8.13 ft | 6.62 ft | 6.66 ft |
| Sun, Oct 25 10:00 | 7.46 ft | 6.06 ft | 6.11 ft |
| Sun, Oct 25 11:00 | 6.28 ft | 4.85 ft | 4.89 ft |
| Sun, Oct 25 12:00 | 4.82 ft | 3.29 ft | 3.33 ft |
| Sun, Oct 25 13:00 | 3.19 ft | 1.72 ft | 1.76 ft |
Measured heights from NOAA CO-OPS station 9410170, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.