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MD · NOAA 8574680 · 39° 16′ N · 76° 35′ W
Tides at Baltimore
A mixed, mainly semidiurnal tide (form factor 0.67), spring this week. Predicted from the station's 33 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, 6:48 PM | High | 1.9 ft |
| Mon, Oct 26, 1:51 AM | Low | 0.5 ft |
| Mon, Oct 26, 6:48 AM | High | 1.3 ft |
| Mon, Oct 26, 12:52 PM | Low | 0.2 ft |
| Mon, Oct 26, 7:34 PM | High | 2.0 ft |
| Tue, Oct 27, 2:48 AM | Low | 0.5 ft |
| Tue, Oct 27, 7:35 AM | High | 1.2 ft |
| Tue, Oct 27, 1:32 PM | Low | 0.2 ft |
| Tue, Oct 27, 8:22 PM | High | 2.0 ft |
| Wed, Oct 28, 3:42 AM | Low | 0.5 ft |
| Wed, Oct 28, 8:23 AM | High | 1.2 ft |
| Wed, Oct 28, 2:17 PM | Low | 0.1 ft |
| Wed, Oct 28, 9:10 PM | High | 2.0 ft |
| Thu, Oct 29, 4:38 AM | Low | 0.5 ft |
| Thu, Oct 29, 9:10 AM | High | 1.1 ft |
| Thu, Oct 29, 3:06 PM | Low | 0.1 ft |
| Thu, Oct 29, 10:02 PM | High | 2.0 ft |
| Fri, Oct 30, 5:37 AM | Low | 0.5 ft |
| Fri, Oct 30, 10:02 AM | High | 1.1 ft |
| Fri, Oct 30, 4:01 PM | Low | 0.2 ft |
| Fri, Oct 30, 11:02 PM | High | 1.9 ft |
| Sat, Oct 31, 6:37 AM | Low | 0.5 ft |
| Sat, Oct 31, 11:04 AM | High | 1.1 ft |
| Sat, Oct 31, 5:10 PM | Low | 0.2 ft |
| Sun, Nov 1, 12:11 AM | High | 1.8 ft |
| Sun, Nov 1, 6:33 AM | Low | 0.5 ft |
| Sun, Nov 1, 11:18 AM | High | 1.1 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| M2 | 0.5 ft | 336.3° |
| SA | 0.4 ft | 132.6° |
| K1 | 0.2 ft | 7.0° |
| O1 | 0.2 ft | 14.0° |
| SSA | 0.1 ft | 49.5° |
| N2 | 0.1 ft | 313.1° |
| S2 | 0.1 ft | 8.3° |
| P1 | 0.1 ft | 2.2° |
The eight largest of 33. Source: NOAA CO-OPS harmonic constituents for 8574680, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 16:24 the gauge read 2.4 ft, 1.0 ft above the computed curve: wind and pressure, not the moon. The widest gap of the two days was 1.5 ft, at Sat, Oct 24 10:30.
- 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 05:00 | 2.46 ft | 1.29 ft | 1.29 ft |
| Sun, Oct 25 06:00 | 2.56 ft | 1.37 ft | 1.38 ft |
| Sun, Oct 25 07:00 | 2.47 ft | 1.31 ft | 1.31 ft |
| Sun, Oct 25 08:00 | 2.22 ft | 1.11 ft | 1.11 ft |
| Sun, Oct 25 09:00 | 1.96 ft | 0.84 ft | 0.84 ft |
| Sun, Oct 25 10:00 | 1.71 ft | 0.57 ft | 0.57 ft |
| Sun, Oct 25 11:00 | 1.53 ft | 0.37 ft | 0.36 ft |
| Sun, Oct 25 12:00 | 1.42 ft | 0.27 ft | 0.26 ft |
| Sun, Oct 25 13:00 | 1.40 ft | 0.30 ft | 0.28 ft |
| Sun, Oct 25 14:00 | 1.57 ft | 0.48 ft | 0.47 ft |
| Sun, Oct 25 15:00 | 1.93 ft | 0.82 ft | 0.81 ft |
| Sun, Oct 25 16:00 | 2.25 ft | 1.22 ft | 1.21 ft |
Measured heights from NOAA CO-OPS station 8574680, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.