PAINTED SHORES
MENUBegin
TX · NOAA 8779770 · 26° 04′ N · 97° 13′ W
Tides at Port Isabel
A diurnal tide (form factor 3.26), 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, 5:03 PM | High | 1.9 ft |
| Mon, Oct 26, 9:40 AM | Low | 0.2 ft |
| Mon, Oct 26, 6:19 PM | High | 2.0 ft |
| Tue, Oct 27, 10:20 AM | Low | 0.0 ft |
| Tue, Oct 27, 7:42 PM | High | 2.1 ft |
| Wed, Oct 28, 11:07 AM | Low | -0.1 ft |
| Wed, Oct 28, 9:12 PM | High | 2.2 ft |
| Thu, Oct 29, 12:04 PM | Low | -0.1 ft |
| Thu, Oct 29, 10:59 PM | High | 2.2 ft |
| Fri, Oct 30, 1:06 PM | Low | -0.1 ft |
| Sat, Oct 31, 12:02 AM | High | 2.1 ft |
| Sat, Oct 31, 2:06 PM | Low | 0.0 ft |
| Sun, Nov 1, 12:50 AM | High | 2.0 ft |
| Sun, Nov 1, 2:09 PM | Low | 0.2 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| K1 | 0.4 ft | 36.5° |
| O1 | 0.4 ft | 29.0° |
| SSA | 0.3 ft | 49.6° |
| SA | 0.2 ft | 186.1° |
| M2 | 0.2 ft | 274.3° |
| P1 | 0.1 ft | 36.3° |
| Q1 | 0.1 ft | 12.6° |
| S2 | 0.1 ft | 285.8° |
The eight largest of 32. Source: NOAA CO-OPS harmonic constituents for 8779770, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 15:24 the gauge read 2.5 ft, 0.7 ft above the computed curve: wind and pressure, not the moon. The widest gap of the two days was 0.8 ft, at Sun, Oct 25 14:42.
- 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 |
|---|---|---|---|
| Sun, Oct 25 04:00 | 1.84 ft | 1.25 ft | 1.26 ft |
| Sun, Oct 25 05:00 | 1.61 ft | 1.07 ft | 1.08 ft |
| Sun, Oct 25 06:00 | 1.41 ft | 0.86 ft | 0.86 ft |
| Sun, Oct 25 07:00 | 1.22 ft | 0.67 ft | 0.67 ft |
| Sun, Oct 25 08:00 | 1.08 ft | 0.54 ft | 0.53 ft |
| Sun, Oct 25 09:00 | 1.10 ft | 0.48 ft | 0.47 ft |
| Sun, Oct 25 10:00 | 1.20 ft | 0.53 ft | 0.52 ft |
| Sun, Oct 25 11:00 | 1.37 ft | 0.69 ft | 0.68 ft |
| Sun, Oct 25 12:00 | 1.67 ft | 0.94 ft | 0.92 ft |
| Sun, Oct 25 13:00 | 1.94 ft | 1.21 ft | 1.19 ft |
| Sun, Oct 25 14:00 | 2.20 ft | 1.47 ft | 1.46 ft |
| Sun, Oct 25 15:00 | 2.43 ft | 1.70 ft | 1.68 ft |
Measured heights from NOAA CO-OPS station 8779770, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.