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WA · NOAA 9449880 · 48° 33′ N · 123° 01′ W
Tides at Friday Harbor
A mixed, mainly diurnal tide (form factor 1.73), spring this week. Predicted from the station's 37 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, 4:01 PM | High | 7.4 ft |
| Sun, Oct 25, 11:04 PM | Low | -0.5 ft |
| Mon, Oct 26, 6:46 AM | High | 7.5 ft |
| Mon, Oct 26, 11:13 AM | Low | 5.4 ft |
| Mon, Oct 26, 4:19 PM | High | 7.5 ft |
| Mon, Oct 26, 11:41 PM | Low | -1.5 ft |
| Tue, Oct 27, 7:43 AM | High | 8.0 ft |
| Tue, Oct 27, 12:02 PM | Low | 6.1 ft |
| Tue, Oct 27, 4:40 PM | High | 7.7 ft |
| Wed, Oct 28, 12:22 AM | Low | -2.1 ft |
| Wed, Oct 28, 8:40 AM | High | 8.4 ft |
| Wed, Oct 28, 12:55 PM | Low | 6.7 ft |
| Wed, Oct 28, 5:05 PM | High | 7.7 ft |
| Thu, Oct 29, 1:08 AM | Low | -2.3 ft |
| Thu, Oct 29, 9:41 AM | High | 8.5 ft |
| Thu, Oct 29, 1:55 PM | Low | 7.1 ft |
| Thu, Oct 29, 5:33 PM | High | 7.6 ft |
| Fri, Oct 30, 1:57 AM | Low | -2.2 ft |
| Fri, Oct 30, 10:46 AM | High | 8.5 ft |
| Fri, Oct 30, 3:21 PM | Low | 7.2 ft |
| Fri, Oct 30, 6:01 PM | High | 7.3 ft |
| Sat, Oct 31, 2:50 AM | Low | -1.8 ft |
| Sat, Oct 31, 11:48 AM | High | 8.4 ft |
| Sun, Nov 1, 2:49 AM | Low | -1.0 ft |
| Sun, Nov 1, 11:43 AM | High | 8.3 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| K1 | 2.5 ft | 280.4° |
| M2 | 1.8 ft | 10.6° |
| O1 | 1.4 ft | 258.7° |
| P1 | 0.8 ft | 278.0° |
| S2 | 0.4 ft | 35.7° |
| N2 | 0.4 ft | 343.0° |
| SA | 0.2 ft | 274.5° |
| Q1 | 0.2 ft | 250.7° |
The eight largest of 37. Source: NOAA CO-OPS harmonic constituents for 9449880, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 13:24 the gauge read 6.7 ft, 0.7 ft above the computed curve: wind and pressure, not the moon. The widest gap of the two days was 0.7 ft, at Sun, Oct 25 13:24.
- 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 | 4.01 ft | 3.65 ft | 3.56 ft |
| Sun, Oct 25 03:00 | 5.26 ft | 4.96 ft | 4.87 ft |
| Sun, Oct 25 04:00 | 6.32 ft | 6.01 ft | 5.92 ft |
| Sun, Oct 25 05:00 | 6.97 ft | 6.65 ft | 6.57 ft |
| Sun, Oct 25 06:00 | 7.18 ft | 6.79 ft | 6.74 ft |
| Sun, Oct 25 07:00 | 6.81 ft | 6.45 ft | 6.41 ft |
| Sun, Oct 25 08:00 | 6.16 ft | 5.76 ft | 5.74 ft |
| Sun, Oct 25 09:00 | 5.53 ft | 5.01 ft | 5.01 ft |
| Sun, Oct 25 10:00 | 5.12 ft | 4.54 ft | 4.57 ft |
| Sun, Oct 25 11:00 | 5.23 ft | 4.56 ft | 4.61 ft |
| Sun, Oct 25 12:00 | 5.59 ft | 4.99 ft | 5.06 ft |
| Sun, Oct 25 13:00 | 6.34 ft | 5.68 ft | 5.76 ft |
Measured heights from NOAA CO-OPS station 9449880, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.