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CA · NOAA 9410840 · 34° 00′ N · 118° 30′ W
Tides at Santa Monica
A mixed, mainly semidiurnal tide (form factor 0.79), spring this week. Predicted from the station's 31 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, 3:35 PM | Low | -0.4 ft |
| Sun, Oct 25, 9:47 PM | High | 4.5 ft |
| Mon, Oct 26, 3:07 AM | Low | 1.4 ft |
| Mon, Oct 26, 9:21 AM | High | 6.5 ft |
| Mon, Oct 26, 4:18 PM | Low | -0.7 ft |
| Mon, Oct 26, 10:36 PM | High | 4.3 ft |
| Tue, Oct 27, 3:37 AM | Low | 1.8 ft |
| Tue, Oct 27, 9:55 AM | High | 6.7 ft |
| Tue, Oct 27, 5:06 PM | Low | -0.9 ft |
| Tue, Oct 27, 11:32 PM | High | 3.9 ft |
| Wed, Oct 28, 4:11 AM | Low | 2.1 ft |
| Wed, Oct 28, 10:33 AM | High | 6.6 ft |
| Wed, Oct 28, 6:00 PM | Low | -0.8 ft |
| Thu, Oct 29, 12:39 AM | High | 3.6 ft |
| Thu, Oct 29, 4:49 AM | Low | 2.5 ft |
| Thu, Oct 29, 11:19 AM | High | 6.4 ft |
| Thu, Oct 29, 7:00 PM | Low | -0.6 ft |
| Fri, Oct 30, 2:01 AM | High | 3.4 ft |
| Fri, Oct 30, 5:37 AM | Low | 2.9 ft |
| Fri, Oct 30, 12:14 PM | High | 6.0 ft |
| Fri, Oct 30, 8:10 PM | Low | -0.3 ft |
| Sat, Oct 31, 3:42 AM | High | 3.5 ft |
| Sat, Oct 31, 6:54 AM | Low | 3.2 ft |
| Sat, Oct 31, 1:25 PM | High | 5.5 ft |
| Sat, Oct 31, 9:29 PM | Low | -0.1 ft |
| Sun, Nov 1, 4:01 AM | High | 3.9 ft |
| Sun, Nov 1, 8:03 AM | Low | 3.2 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| M2 | 1.7 ft | 146.8° |
| K1 | 1.1 ft | 208.9° |
| O1 | 0.7 ft | 193.5° |
| S2 | 0.7 ft | 143.1° |
| N2 | 0.4 ft | 125.3° |
| P1 | 0.4 ft | 205.3° |
| SA | 0.2 ft | 177.9° |
| K2 | 0.2 ft | 135.3° |
The eight largest of 31. Source: NOAA CO-OPS harmonic constituents for 9410840, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 13:24 the gauge read 2.5 ft, 1.4 ft above the computed curve: wind and pressure, not the moon. The widest gap of the two days was 1.6 ft, at Sat, Oct 24 00:00.
- 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 | 2.60 ft | 1.25 ft | 1.24 ft |
| Sun, Oct 25 03:00 | 2.47 ft | 1.18 ft | 1.17 ft |
| Sun, Oct 25 04:00 | 3.04 ft | 1.68 ft | 1.68 ft |
| Sun, Oct 25 05:00 | 4.04 ft | 2.66 ft | 2.68 ft |
| Sun, Oct 25 06:00 | 5.34 ft | 3.91 ft | 3.94 ft |
| Sun, Oct 25 07:00 | 6.49 ft | 5.11 ft | 5.15 ft |
| Sun, Oct 25 08:00 | 7.42 ft | 5.96 ft | 6.00 ft |
| Sun, Oct 25 09:00 | 7.66 ft | 6.22 ft | 6.26 ft |
| Sun, Oct 25 10:00 | 7.18 ft | 5.76 ft | 5.80 ft |
| Sun, Oct 25 11:00 | 6.11 ft | 4.68 ft | 4.72 ft |
| Sun, Oct 25 12:00 | 4.62 ft | 3.22 ft | 3.26 ft |
| Sun, Oct 25 13:00 | 3.07 ft | 1.71 ft | 1.74 ft |
Measured heights from NOAA CO-OPS station 9410840, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.