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RI · NOAA 8452660 · 41° 30′ N · 71° 20′ W
Tides at Newport
A semidiurnal tide (form factor 0.18), spring this week. Predicted from the station's 35 harmonic constants; heights above mean lower low water, times in station time. Weather is not in these numbers.
This week
| When | Water | Height |
|---|---|---|
| Wed, Oct 28, 3:47 PM | Low | -0.1 ft |
| Wed, Oct 28, 10:17 PM | High | 3.8 ft |
| Thu, Oct 29, 3:31 AM | Low | -0.2 ft |
| Thu, Oct 29, 10:39 AM | High | 4.5 ft |
| Thu, Oct 29, 4:36 PM | Low | 0.1 ft |
| Thu, Oct 29, 11:13 PM | High | 3.7 ft |
| Fri, Oct 30, 4:20 AM | Low | -0.0 ft |
| Fri, Oct 30, 11:37 AM | High | 4.2 ft |
| Fri, Oct 30, 5:32 PM | Low | 0.3 ft |
| Sat, Oct 31, 12:12 AM | High | 3.6 ft |
| Sat, Oct 31, 5:14 AM | Low | 0.2 ft |
| Sat, Oct 31, 12:39 PM | High | 4.0 ft |
| Sat, Oct 31, 7:02 PM | Low | 0.5 ft |
| Sun, Nov 1, 1:14 AM | High | 3.5 ft |
| Sun, Nov 1, 5:20 AM | Low | 0.5 ft |
| Sun, Nov 1, 12:42 PM | High | 3.8 ft |
| Sun, Nov 1, 7:50 PM | Low | 0.5 ft |
| Mon, Nov 2, 1:16 AM | High | 3.6 ft |
| Mon, Nov 2, 7:04 AM | Low | 0.7 ft |
| Mon, Nov 2, 1:44 PM | High | 3.7 ft |
| Mon, Nov 2, 8:54 PM | Low | 0.5 ft |
| Tue, Nov 3, 2:18 AM | High | 3.7 ft |
| Tue, Nov 3, 9:00 AM | Low | 0.6 ft |
| Tue, Nov 3, 2:47 PM | High | 3.6 ft |
| Tue, Nov 3, 9:42 PM | Low | 0.4 ft |
| Wed, Nov 4, 3:21 AM | High | 3.8 ft |
| Wed, Nov 4, 10:02 AM | Low | 0.5 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| M2 | 1.7 ft | 2.3° |
| N2 | 0.4 ft | 345.8° |
| S2 | 0.4 ft | 25.0° |
| K1 | 0.2 ft | 166.1° |
| SA | 0.2 ft | 145.3° |
| M4 | 0.2 ft | 35.8° |
| O1 | 0.2 ft | 202.0° |
| K2 | 0.1 ft | 21.7° |
The eight largest of 35. Source: NOAA CO-OPS harmonic constituents for 8452660, public domain.
The year as a print
The last two days, measured
At Wed, Oct 28 13:24 the gauge read 1.5 ft, 0.3 ft above the computed curve: wind and pressure, not the moon. The widest gap of the two days was 0.7 ft, at Tue, Oct 27 19:42.
- 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 |
|---|---|---|---|
| Wed, Oct 28 02:00 | 0.15 ft | -0.19 ft | -0.20 ft |
| Wed, Oct 28 03:00 | 0.05 ft | -0.33 ft | -0.35 ft |
| Wed, Oct 28 04:00 | 0.32 ft | 0.02 ft | 0.01 ft |
| Wed, Oct 28 05:00 | 0.92 ft | 0.67 ft | 0.66 ft |
| Wed, Oct 28 06:00 | 1.83 ft | 1.52 ft | 1.52 ft |
| Wed, Oct 28 07:00 | 2.91 ft | 2.55 ft | 2.55 ft |
| Wed, Oct 28 08:00 | 4.03 ft | 3.61 ft | 3.61 ft |
| Wed, Oct 28 09:00 | 4.84 ft | 4.40 ft | 4.41 ft |
| Wed, Oct 28 10:00 | 5.11 ft | 4.60 ft | 4.61 ft |
| Wed, Oct 28 11:00 | 4.60 ft | 4.07 ft | 4.08 ft |
| Wed, Oct 28 12:00 | 3.43 ft | 2.98 ft | 2.99 ft |
| Wed, Oct 28 13:00 | 2.03 ft | 1.69 ft | 1.70 ft |
Measured heights from NOAA CO-OPS station 8452660, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.