PAINTED SHORES
MENUBegin
TX · NOAA 8771450 · 29° 19′ N · 94° 48′ W
Tides at Galveston Pier 21
A mixed, mainly diurnal tide (form factor 2.33), spring this week. Predicted from the station's 32 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, 5:34 PM | High | 1.9 ft |
| Sun, Oct 25, 10:53 PM | Low | 1.5 ft |
| Mon, Oct 26, 2:55 AM | High | 1.6 ft |
| Mon, Oct 26, 10:25 AM | Low | 0.2 ft |
| Mon, Oct 26, 6:30 PM | High | 2.0 ft |
| Mon, Oct 26, 11:53 PM | Low | 1.7 ft |
| Tue, Oct 27, 2:48 AM | High | 1.7 ft |
| Tue, Oct 27, 11:04 AM | Low | -0.0 ft |
| Tue, Oct 27, 7:28 PM | High | 2.1 ft |
| Wed, Oct 28, 11:50 AM | Low | -0.1 ft |
| Wed, Oct 28, 8:33 PM | High | 2.1 ft |
| Thu, Oct 29, 12:44 PM | Low | -0.1 ft |
| Thu, Oct 29, 9:50 PM | High | 2.0 ft |
| Fri, Oct 30, 1:46 PM | Low | -0.1 ft |
| Fri, Oct 30, 11:26 PM | High | 2.0 ft |
| Sat, Oct 31, 2:54 PM | Low | 0.0 ft |
| Sun, Nov 1, 12:42 AM | High | 1.9 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| K1 | 0.4 ft | 53.3° |
| O1 | 0.4 ft | 45.0° |
| SSA | 0.3 ft | 61.3° |
| SA | 0.3 ft | 154.9° |
| M2 | 0.3 ft | 293.5° |
| P1 | 0.1 ft | 46.8° |
| Q1 | 0.1 ft | 26.7° |
| S2 | 0.1 ft | 295.4° |
The eight largest of 32. Source: NOAA CO-OPS harmonic constituents for 8771450, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 15:24 the gauge read 2.4 ft, 0.8 ft above the computed curve: wind and pressure, not the moon. The widest gap of the two days was 1.0 ft, at Sun, Oct 25 07:30.
- 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 04:00 | 2.37 ft | 1.54 ft | 1.55 ft |
| Sun, Oct 25 05:00 | 2.19 ft | 1.40 ft | 1.41 ft |
| Sun, Oct 25 06:00 | 2.06 ft | 1.16 ft | 1.17 ft |
| Sun, Oct 25 07:00 | 1.89 ft | 0.88 ft | 0.88 ft |
| Sun, Oct 25 08:00 | 1.66 ft | 0.62 ft | 0.62 ft |
| Sun, Oct 25 09:00 | 1.45 ft | 0.46 ft | 0.46 ft |
| Sun, Oct 25 10:00 | 1.27 ft | 0.42 ft | 0.41 ft |
| Sun, Oct 25 11:00 | 1.36 ft | 0.49 ft | 0.48 ft |
| Sun, Oct 25 12:00 | 1.55 ft | 0.67 ft | 0.65 ft |
| Sun, Oct 25 13:00 | 1.75 ft | 0.93 ft | 0.91 ft |
| Sun, Oct 25 14:00 | 2.03 ft | 1.23 ft | 1.22 ft |
| Sun, Oct 25 15:00 | 2.30 ft | 1.53 ft | 1.51 ft |
Measured heights from NOAA CO-OPS station 8771450, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.