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WA · NOAA 9444900 · 48° 07′ N · 122° 46′ W
Tides at Port Townsend
A mixed, mainly semidiurnal tide (form factor 1.43), spring this week. Predicted from the station's 34 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, 3:40 PM | High | 8.4 ft |
| Sun, Oct 25, 10:14 PM | Low | -0.8 ft |
| Mon, Oct 26, 5:48 AM | High | 8.3 ft |
| Mon, Oct 26, 10:24 AM | Low | 5.3 ft |
| Mon, Oct 26, 4:05 PM | High | 8.5 ft |
| Mon, Oct 26, 10:51 PM | Low | -1.9 ft |
| Tue, Oct 27, 6:43 AM | High | 8.7 ft |
| Tue, Oct 27, 11:09 AM | Low | 6.0 ft |
| Tue, Oct 27, 4:31 PM | High | 8.5 ft |
| Tue, Oct 27, 11:32 PM | Low | -2.5 ft |
| Wed, Oct 28, 7:39 AM | High | 9.0 ft |
| Wed, Oct 28, 11:58 AM | Low | 6.7 ft |
| Wed, Oct 28, 4:59 PM | High | 8.4 ft |
| Thu, Oct 29, 12:17 AM | Low | -2.7 ft |
| Thu, Oct 29, 8:39 AM | High | 9.1 ft |
| Thu, Oct 29, 12:55 PM | Low | 7.1 ft |
| Thu, Oct 29, 5:29 PM | High | 8.2 ft |
| Fri, Oct 30, 1:07 AM | Low | -2.5 ft |
| Fri, Oct 30, 9:43 AM | High | 9.1 ft |
| Fri, Oct 30, 2:08 PM | Low | 7.3 ft |
| Fri, Oct 30, 6:04 PM | High | 7.8 ft |
| Sat, Oct 31, 2:02 AM | Low | -2.0 ft |
| Sat, Oct 31, 10:48 AM | High | 9.0 ft |
| Sat, Oct 31, 3:53 PM | Low | 7.1 ft |
| Sat, Oct 31, 6:54 PM | High | 7.2 ft |
| Sun, Nov 1, 2:01 AM | Low | -1.1 ft |
| Sun, Nov 1, 10:47 AM | High | 9.0 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| K1 | 2.5 ft | 270.5° |
| M2 | 2.2 ft | 349.9° |
| O1 | 1.5 ft | 249.8° |
| P1 | 0.8 ft | 269.7° |
| S2 | 0.6 ft | 13.1° |
| N2 | 0.5 ft | 320.4° |
| SA | 0.3 ft | 282.6° |
| Q1 | 0.2 ft | 241.7° |
The eight largest of 34. Source: NOAA CO-OPS harmonic constituents for 9444900, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 13:24 the gauge read 7.6 ft, 0.5 ft above the computed curve: wind and pressure, not the moon. The widest gap of the two days was 0.6 ft, at Sun, Oct 25 08:12.
- 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 | 5.34 ft | 5.18 ft | 5.09 ft |
| Sun, Oct 25 03:00 | 6.89 ft | 6.54 ft | 6.45 ft |
| Sun, Oct 25 04:00 | 7.76 ft | 7.43 ft | 7.35 ft |
| Sun, Oct 25 05:00 | 8.08 ft | 7.69 ft | 7.62 ft |
| Sun, Oct 25 06:00 | 7.69 ft | 7.31 ft | 7.26 ft |
| Sun, Oct 25 07:00 | 6.79 ft | 6.42 ft | 6.39 ft |
| Sun, Oct 25 08:00 | 5.84 ft | 5.36 ft | 5.35 ft |
| Sun, Oct 25 09:00 | 4.99 ft | 4.60 ft | 4.62 ft |
| Sun, Oct 25 10:00 | 4.83 ft | 4.46 ft | 4.49 ft |
| Sun, Oct 25 11:00 | 5.39 ft | 4.93 ft | 4.98 ft |
| Sun, Oct 25 12:00 | 6.18 ft | 5.77 ft | 5.84 ft |
| Sun, Oct 25 13:00 | 7.15 ft | 6.70 ft | 6.78 ft |
Measured heights from NOAA CO-OPS station 9444900, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.