PAINTED SHORES
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OR · NOAA 9439040 · 46° 12′ N · 123° 46′ W
Tides at Astoria
A mixed, mainly semidiurnal tide (form factor 0.54), 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 |
|---|---|---|
| Mon, Oct 26, 2:08 AM | High | 7.8 ft |
| Mon, Oct 26, 7:43 AM | Low | 1.8 ft |
| Mon, Oct 26, 1:37 PM | High | 9.5 ft |
| Mon, Oct 26, 8:35 PM | Low | -1.3 ft |
| Tue, Oct 27, 2:57 AM | High | 7.8 ft |
| Tue, Oct 27, 8:23 AM | Low | 2.3 ft |
| Tue, Oct 27, 2:12 PM | High | 9.8 ft |
| Tue, Oct 27, 9:20 PM | Low | -1.4 ft |
| Wed, Oct 28, 3:47 AM | High | 7.6 ft |
| Wed, Oct 28, 9:06 AM | Low | 2.7 ft |
| Wed, Oct 28, 2:52 PM | High | 9.8 ft |
| Wed, Oct 28, 10:06 PM | Low | -1.4 ft |
| Thu, Oct 29, 4:41 AM | High | 7.4 ft |
| Thu, Oct 29, 9:52 AM | Low | 3.0 ft |
| Thu, Oct 29, 3:36 PM | High | 9.6 ft |
| Thu, Oct 29, 10:57 PM | Low | -1.1 ft |
| Fri, Oct 30, 5:38 AM | High | 7.2 ft |
| Fri, Oct 30, 10:44 AM | Low | 3.3 ft |
| Fri, Oct 30, 4:26 PM | High | 9.2 ft |
| Fri, Oct 30, 11:53 PM | Low | -0.6 ft |
| Sat, Oct 31, 6:40 AM | High | 7.0 ft |
| Sat, Oct 31, 11:46 AM | Low | 3.5 ft |
| Sat, Oct 31, 5:27 PM | High | 8.5 ft |
| Sun, Nov 1, 12:56 AM | Low | -0.1 ft |
| Sun, Nov 1, 6:45 AM | High | 7.0 ft |
| Sun, Nov 1, 12:03 PM | Low | 3.6 ft |
| Sun, Nov 1, 5:41 PM | High | 7.8 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| M2 | 3.2 ft | 261.6° |
| K1 | 1.3 ft | 254.5° |
| O1 | 0.8 ft | 239.6° |
| S2 | 0.8 ft | 293.8° |
| N2 | 0.6 ft | 239.5° |
| SA | 0.4 ft | 308.7° |
| P1 | 0.4 ft | 251.4° |
| K2 | 0.2 ft | 283.4° |
The eight largest of 34. Source: NOAA CO-OPS harmonic constituents for 9439040, public domain.
The year as a print
The last two days, measured
At Mon, Oct 26 01:12 the gauge read 7.8 ft, 0.5 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 17:24.
- 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 14:00 | 9.24 ft | 8.63 ft | 8.68 ft |
| Sun, Oct 25 15:00 | 7.67 ft | 7.14 ft | 7.19 ft |
| Sun, Oct 25 16:00 | 5.52 ft | 5.00 ft | 5.05 ft |
| Sun, Oct 25 17:00 | 3.41 ft | 2.74 ft | 2.79 ft |
| Sun, Oct 25 18:00 | 1.52 ft | 0.82 ft | 0.86 ft |
| Sun, Oct 25 19:00 | 0.15 ft | -0.46 ft | -0.43 ft |
| Sun, Oct 25 20:00 | -0.54 ft | -0.86 ft | -0.84 ft |
| Sun, Oct 25 21:00 | 0.14 ft | -0.17 ft | -0.17 ft |
| Sun, Oct 25 22:00 | 2.11 ft | 1.45 ft | 1.45 ft |
| Sun, Oct 25 23:00 | 4.19 ft | 3.54 ft | 3.52 ft |
| Mon, Oct 26 00:00 | 6.19 ft | 5.57 ft | 5.54 ft |
| Mon, Oct 26 01:00 | 7.58 ft | 7.10 ft | 7.07 ft |
Measured heights from NOAA CO-OPS station 9439040, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.