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Am. Samoa · NOAA 1770000 · 14° 17′ S · 170° 41′ W
Tides at Pago Pago, American Samoa
A semidiurnal tide (form factor 0.16), spring this week. Predicted from the station's 30 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, 12:11 PM | Low | -0.1 ft |
| Sun, Oct 25, 6:33 PM | High | 3.1 ft |
| Mon, Oct 26, 12:50 AM | Low | -0.2 ft |
| Mon, Oct 26, 6:58 AM | High | 2.8 ft |
| Mon, Oct 26, 12:57 PM | Low | -0.1 ft |
| Mon, Oct 26, 7:21 PM | High | 3.2 ft |
| Tue, Oct 27, 1:42 AM | Low | -0.2 ft |
| Tue, Oct 27, 7:50 AM | High | 2.7 ft |
| Tue, Oct 27, 1:48 PM | Low | -0.1 ft |
| Tue, Oct 27, 8:14 PM | High | 3.2 ft |
| Wed, Oct 28, 2:39 AM | Low | -0.2 ft |
| Wed, Oct 28, 8:47 AM | High | 2.6 ft |
| Wed, Oct 28, 2:44 PM | Low | -0.0 ft |
| Wed, Oct 28, 9:12 PM | High | 3.1 ft |
| Thu, Oct 29, 3:39 AM | Low | -0.2 ft |
| Thu, Oct 29, 9:50 AM | High | 2.5 ft |
| Thu, Oct 29, 3:46 PM | Low | 0.1 ft |
| Thu, Oct 29, 10:15 PM | High | 3.0 ft |
| Fri, Oct 30, 4:44 AM | Low | -0.1 ft |
| Fri, Oct 30, 10:57 AM | High | 2.5 ft |
| Fri, Oct 30, 4:52 PM | Low | 0.2 ft |
| Fri, Oct 30, 11:23 PM | High | 2.9 ft |
| Sat, Oct 31, 5:50 AM | Low | -0.1 ft |
| Sat, Oct 31, 12:06 PM | High | 2.5 ft |
| Sat, Oct 31, 6:03 PM | Low | 0.2 ft |
| Sun, Nov 1, 12:31 AM | High | 2.9 ft |
| Sun, Nov 1, 6:55 AM | Low | -0.1 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| M2 | 1.2 ft | 179.8° |
| N2 | 0.3 ft | 160.4° |
| S2 | 0.2 ft | 164.9° |
| K1 | 0.1 ft | 81.9° |
| O1 | 0.1 ft | 67.2° |
| NU2 | 0.1 ft | 161.3° |
| MU2 | 0.1 ft | 139.8° |
| 2N2 | 0.1 ft | 139.9° |
The eight largest of 30. Source: NOAA CO-OPS harmonic constituents for 1770000, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 09:24 the gauge read 1.3 ft, on the computed curve to the tenth of a foot: a quiet sky.
- 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 |
|---|---|---|---|
| Sat, Oct 24 22:00 | 0.73 ft | 0.66 ft | 0.66 ft |
| Sat, Oct 24 23:00 | 0.10 ft | 0.10 ft | 0.11 ft |
| Sun, Oct 25 00:00 | -0.11 ft | -0.11 ft | -0.10 ft |
| Sun, Oct 25 01:00 | 0.05 ft | 0.07 ft | 0.07 ft |
| Sun, Oct 25 02:00 | 0.46 ft | 0.59 ft | 0.59 ft |
| Sun, Oct 25 03:00 | 1.15 ft | 1.30 ft | 1.30 ft |
| Sun, Oct 25 04:00 | 1.99 ft | 2.02 ft | 2.02 ft |
| Sun, Oct 25 05:00 | 2.51 ft | 2.58 ft | 2.58 ft |
| Sun, Oct 25 06:00 | 2.73 ft | 2.82 ft | 2.82 ft |
| Sun, Oct 25 07:00 | 2.73 ft | 2.69 ft | 2.69 ft |
| Sun, Oct 25 08:00 | 2.21 ft | 2.21 ft | 2.21 ft |
| Sun, Oct 25 09:00 | 1.58 ft | 1.51 ft | 1.51 ft |
Measured heights from NOAA CO-OPS station 1770000, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.