NOAA is monitoring water levels and winds for Tropical Storm Alvin. Click to view real-time water level and meteorological data.
| Datum | Value | Description |
|---|---|---|
| MHHW | 3.60 | Mean Higher-High Water |
| MHW | 3.31 | Mean High Water |
| MTL | 2.12 | Mean Tide Level |
| MSL | 2.08 | Mean Sea Level |
| DTL | 1.80 | Mean Diurnal Tide Level |
| MLW | 0.93 | Mean Low Water |
| MLLW | 0.00 | Mean Lower-Low Water |
| NAVD88 | -0.26 | North American Vertical Datum of 1988 |
| STND | -2.60 | Station Datum |
| GT | 3.60 | Great Diurnal Range |
| MN | 2.39 | Mean Range of Tide |
| DHQ | 0.28 | Mean Diurnal High Water Inequality |
| DLQ | 0.93 | Mean Diurnal Low Water Inequality |
| HWI | 2.79 | Greenwich High Water Interval (in hours) |
| LWI | 8.98 | Greenwich Low Water Interval (in hours) |
| Max Tide | 6.70 | Highest Observed Tide |
| Max Tide Date & Time | 01/27/1960 22:36 | Highest Observed Tide Date & Time |
| Min Tide | -2.78 | Lowest Observed Tide |
| Min Tide Date & Time | 12/13/2008 08:48 | Lowest Observed Tide Date & Time |
| HAT | 5.22 | Highest Astronomical Tide |
| HAT Date & Time | 12/30/1990 23:18 | HAT Date and Time |
| LAT | -1.85 | Lowest Astronomical Tide |
| LAT Date & Time | 06/22/1986 21:00 | LAT Date and Time |
| Tidal Datum Analysis Periods |
|---|
| 01/01/1997 - 12/31/2001 |