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CA · NOAA 9414750 · 37° 46′ N · 122° 18′ W
Tides at Alameda
A mixed, mainly semidiurnal tide (form factor 0.73), 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 |
|---|---|---|
| Tue, Oct 27, 12:45 PM | High | 7.4 ft |
| Tue, Oct 27, 7:40 PM | Low | -1.0 ft |
| Wed, Oct 28, 2:43 AM | High | 5.6 ft |
| Wed, Oct 28, 7:28 AM | Low | 2.9 ft |
| Wed, Oct 28, 1:26 PM | High | 7.4 ft |
| Wed, Oct 28, 8:30 PM | Low | -1.1 ft |
| Thu, Oct 29, 3:43 AM | High | 5.4 ft |
| Thu, Oct 29, 8:19 AM | Low | 3.2 ft |
| Thu, Oct 29, 2:13 PM | High | 7.2 ft |
| Thu, Oct 29, 9:25 PM | Low | -0.9 ft |
| Fri, Oct 30, 4:47 AM | High | 5.3 ft |
| Fri, Oct 30, 9:20 AM | Low | 3.4 ft |
| Fri, Oct 30, 3:08 PM | High | 6.9 ft |
| Fri, Oct 30, 10:27 PM | Low | -0.7 ft |
| Sat, Oct 31, 5:53 AM | High | 5.3 ft |
| Sat, Oct 31, 10:37 AM | Low | 3.4 ft |
| Sat, Oct 31, 4:13 PM | High | 6.4 ft |
| Sat, Oct 31, 11:34 PM | Low | -0.4 ft |
| Sun, Nov 1, 5:56 AM | High | 5.4 ft |
| Sun, Nov 1, 11:02 AM | Low | 3.2 ft |
| Sun, Nov 1, 4:30 PM | High | 5.9 ft |
| Sun, Nov 1, 11:42 PM | Low | -0.1 ft |
| Mon, Nov 2, 6:52 AM | High | 5.7 ft |
| Mon, Nov 2, 12:23 PM | Low | 2.7 ft |
| Mon, Nov 2, 5:54 PM | High | 5.6 ft |
| Tue, Nov 3, 12:44 AM | Low | 0.1 ft |
| Tue, Nov 3, 7:41 AM | High | 6.0 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| M2 | 2.2 ft | 223.3° |
| K1 | 1.2 ft | 232.7° |
| O1 | 0.8 ft | 216.2° |
| S2 | 0.5 ft | 234.4° |
| N2 | 0.5 ft | 199.5° |
| P1 | 0.4 ft | 230.1° |
| K2 | 0.2 ft | 222.2° |
| Q1 | 0.1 ft | 211.3° |
The eight largest of 32. Source: NOAA CO-OPS harmonic constituents for 9414750, public domain.
The year as a print
The last two days, measured
At Tue, Oct 27 10:36 the gauge read 6.9 ft, 1.0 ft above the computed curve: wind and pressure, not the moon. The widest gap of the two days was 1.4 ft, at Mon, Oct 26 16:54.
- 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 |
|---|---|---|---|
| Mon, Oct 26 23:00 | 4.21 ft | 3.45 ft | 3.42 ft |
| Tue, Oct 27 00:00 | 5.47 ft | 4.66 ft | 4.62 ft |
| Tue, Oct 27 01:00 | 6.34 ft | 5.46 ft | 5.41 ft |
| Tue, Oct 27 02:00 | 6.68 ft | 5.64 ft | 5.60 ft |
| Tue, Oct 27 03:00 | 6.23 ft | 5.18 ft | 5.14 ft |
| Tue, Oct 27 04:00 | 5.25 ft | 4.26 ft | 4.22 ft |
| Tue, Oct 27 05:00 | 4.10 ft | 3.29 ft | 3.27 ft |
| Tue, Oct 27 06:00 | 3.42 ft | 2.65 ft | 2.63 ft |
| Tue, Oct 27 07:00 | 3.28 ft | 2.52 ft | 2.51 ft |
| Tue, Oct 27 08:00 | 3.69 ft | 2.96 ft | 2.96 ft |
| Tue, Oct 27 09:00 | 4.80 ft | 3.91 ft | 3.93 ft |
| Tue, Oct 27 10:00 | 6.11 ft | 5.16 ft | 5.19 ft |
Measured heights from NOAA CO-OPS station 9414750, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.