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CA · NOAA 9414290 · 37° 48′ N · 122° 28′ W
Tides at San Francisco
A mixed, mainly semidiurnal tide (form factor 0.84), spring this week. Predicted from the station's 33 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, 5:33 PM | Low | -0.3 ft |
| Mon, Oct 26, 12:25 AM | High | 5.0 ft |
| Mon, Oct 26, 5:22 AM | Low | 2.1 ft |
| Mon, Oct 26, 11:39 AM | High | 6.4 ft |
| Mon, Oct 26, 6:15 PM | Low | -0.8 ft |
| Tue, Oct 27, 1:20 AM | High | 5.0 ft |
| Tue, Oct 27, 6:01 AM | Low | 2.5 ft |
| Tue, Oct 27, 12:15 PM | High | 6.6 ft |
| Tue, Oct 27, 7:01 PM | Low | -1.0 ft |
| Wed, Oct 28, 2:18 AM | High | 4.9 ft |
| Wed, Oct 28, 6:44 AM | Low | 2.9 ft |
| Wed, Oct 28, 12:56 PM | High | 6.6 ft |
| Wed, Oct 28, 7:51 PM | Low | -1.1 ft |
| Thu, Oct 29, 3:20 AM | High | 4.8 ft |
| Thu, Oct 29, 7:33 AM | Low | 3.2 ft |
| Thu, Oct 29, 1:43 PM | High | 6.5 ft |
| Thu, Oct 29, 8:46 PM | Low | -1.0 ft |
| Fri, Oct 30, 4:26 AM | High | 4.7 ft |
| Fri, Oct 30, 8:33 AM | Low | 3.4 ft |
| Fri, Oct 30, 2:38 PM | High | 6.2 ft |
| Fri, Oct 30, 9:47 PM | Low | -0.7 ft |
| Sat, Oct 31, 5:34 AM | High | 4.7 ft |
| Sat, Oct 31, 9:51 AM | Low | 3.4 ft |
| Sat, Oct 31, 3:43 PM | High | 5.8 ft |
| Sat, Oct 31, 10:54 PM | Low | -0.4 ft |
| Sun, Nov 1, 5:39 AM | High | 4.8 ft |
| Sun, Nov 1, 10:26 AM | Low | 3.2 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| M2 | 1.9 ft | 208.2° |
| K1 | 1.2 ft | 225.4° |
| O1 | 0.8 ft | 208.4° |
| S2 | 0.4 ft | 216.2° |
| N2 | 0.4 ft | 183.2° |
| P1 | 0.4 ft | 222.1° |
| SA | 0.1 ft | 200.2° |
| Q1 | 0.1 ft | 202.4° |
The eight largest of 33. Source: NOAA CO-OPS harmonic constituents for 9414290, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 13:24 the gauge read 5.7 ft, 1.3 ft above the computed curve: wind and pressure, not the moon. The widest gap of the two days was 1.4 ft, at Sun, Oct 25 12:36.
- 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 02:00 | 4.65 ft | 3.47 ft | 3.44 ft |
| Sun, Oct 25 03:00 | 3.57 ft | 2.49 ft | 2.47 ft |
| Sun, Oct 25 04:00 | 2.88 ft | 1.81 ft | 1.80 ft |
| Sun, Oct 25 05:00 | 2.74 ft | 1.67 ft | 1.67 ft |
| Sun, Oct 25 06:00 | 3.12 ft | 2.07 ft | 2.08 ft |
| Sun, Oct 25 07:00 | 3.97 ft | 2.90 ft | 2.93 ft |
| Sun, Oct 25 08:00 | 4.99 ft | 3.97 ft | 4.00 ft |
| Sun, Oct 25 09:00 | 6.13 ft | 5.02 ft | 5.06 ft |
| Sun, Oct 25 10:00 | 7.02 ft | 5.82 ft | 5.86 ft |
| Sun, Oct 25 11:00 | 7.49 ft | 6.18 ft | 6.22 ft |
| Sun, Oct 25 12:00 | 7.26 ft | 5.93 ft | 5.97 ft |
| Sun, Oct 25 13:00 | 6.29 ft | 4.99 ft | 5.02 ft |
Measured heights from NOAA CO-OPS station 9414290, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.