PAINTED SHORES
MENUBegin
HI · NOAA 1617760 · 19° 44′ N · 155° 03′ W
Tides at Hilo, Hilo Bay, Kuhio Bay
A mixed, mainly semidiurnal tide (form factor 0.81), spring this week. Predicted from the station's 31 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, 2:11 PM | High | 2.0 ft |
| Sun, Oct 25, 8:20 PM | Low | -0.3 ft |
| Mon, Oct 26, 3:14 AM | High | 2.9 ft |
| Mon, Oct 26, 9:34 AM | Low | 0.7 ft |
| Mon, Oct 26, 2:42 PM | High | 1.8 ft |
| Mon, Oct 26, 8:52 PM | Low | -0.3 ft |
| Tue, Oct 27, 3:58 AM | High | 3.0 ft |
| Tue, Oct 27, 10:29 AM | Low | 0.8 ft |
| Tue, Oct 27, 3:14 PM | High | 1.7 ft |
| Tue, Oct 27, 9:28 PM | Low | -0.3 ft |
| Wed, Oct 28, 4:47 AM | High | 3.0 ft |
| Wed, Oct 28, 11:31 AM | Low | 0.9 ft |
| Wed, Oct 28, 3:49 PM | High | 1.5 ft |
| Wed, Oct 28, 10:08 PM | Low | -0.3 ft |
| Thu, Oct 29, 5:40 AM | High | 2.9 ft |
| Thu, Oct 29, 12:38 PM | Low | 0.9 ft |
| Thu, Oct 29, 4:28 PM | High | 1.3 ft |
| Thu, Oct 29, 10:55 PM | Low | -0.1 ft |
| Fri, Oct 30, 6:40 AM | High | 2.8 ft |
| Fri, Oct 30, 2:04 PM | Low | 1.0 ft |
| Fri, Oct 30, 5:23 PM | High | 1.1 ft |
| Fri, Oct 30, 11:49 PM | Low | 0.1 ft |
| Sat, Oct 31, 7:50 AM | High | 2.6 ft |
| Sat, Oct 31, 3:56 PM | Low | 0.9 ft |
| Sat, Oct 31, 7:07 PM | High | 1.0 ft |
| Sun, Nov 1, 12:59 AM | Low | 0.4 ft |
| Sun, Nov 1, 9:09 AM | High | 2.5 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| M2 | 0.7 ft | 29.0° |
| K1 | 0.5 ft | 233.4° |
| S2 | 0.3 ft | 34.6° |
| O1 | 0.3 ft | 222.6° |
| P1 | 0.2 ft | 231.2° |
| SA | 0.2 ft | 188.2° |
| N2 | 0.1 ft | 19.3° |
| K2 | 0.1 ft | 26.6° |
The eight largest of 31. Source: NOAA CO-OPS harmonic constituents for 1617760, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 10:24 the gauge read 1.5 ft, 0.6 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 04:36.
- 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 23:00 | 1.72 ft | 1.18 ft | 1.17 ft |
| Sun, Oct 25 00:00 | 2.38 ft | 1.83 ft | 1.82 ft |
| Sun, Oct 25 01:00 | 2.94 ft | 2.37 ft | 2.37 ft |
| Sun, Oct 25 02:00 | 3.30 ft | 2.70 ft | 2.70 ft |
| Sun, Oct 25 03:00 | 3.29 ft | 2.72 ft | 2.73 ft |
| Sun, Oct 25 04:00 | 3.12 ft | 2.46 ft | 2.47 ft |
| Sun, Oct 25 05:00 | 2.63 ft | 2.00 ft | 2.01 ft |
| Sun, Oct 25 06:00 | 2.12 ft | 1.46 ft | 1.48 ft |
| Sun, Oct 25 07:00 | 1.59 ft | 0.98 ft | 1.00 ft |
| Sun, Oct 25 08:00 | 1.31 ft | 0.67 ft | 0.69 ft |
| Sun, Oct 25 09:00 | 1.17 ft | 0.60 ft | 0.62 ft |
| Sun, Oct 25 10:00 | 1.34 ft | 0.78 ft | 0.80 ft |
Measured heights from NOAA CO-OPS station 1617760, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.