Extratidal Water Level: recent observations

Tangier Island Port Isobel (TIPI)

Note - This data and webpage is a work in progress.


Other Intervals: Last 30 days | Last 3 daysLast 30 days cf Last 3 days | 36-hour Forecast
Other Stations: BRDH | BISH | CBBT | JMTN | KIPT | MNPT | SWPT | WACH | WMPT | YRCG || All

We are currently developing the quality control and tidal constituents to incorporate this station into our Tidewatch system.

If you have questions or suggestions on this project, please contact me, David Forrest drf@vims.edu

VIMS TDS server for interoperable TIPI data access:  tds.vims.edu -- TIPI.nc

See also:

Note that the red line (m30) is a weighted running mean of the last 30 days of observations, indicating a recent baseline to compare against.  The other tidal datums described below and the tidal model have not been established for this station, due to the short history of observations.

A Brief Summary and Explanation of Terms

  • Extratidal High Water (XHW) and Extratidal Low Water (XLW) are observed water-level extremes measured above the tidal datum HAT (XHW) or below the tidal datum LAT (XLW). These extremes occur only in the presence of a weather-induced residual water level or "storm surge" (observed water level minus the astronomic tide), a sea-level anomaly (m30-MSL vertical difference) or, more often, a combination of the two. The astronomic tide—the water level change occurring at tidal frequencies—will not exceed either datum in the absence of a sea-level anomaly.
  • m30 is the 30-day mean water level covering the period of observation shown. It represents a time-local departure from MSL that is due to a combination of the seasonal tide, the decadal change in sea level, and the long-term sea-level trend relative to the land. The vertical reference for the astronomic tide is m30.
  • HAT83 is the elevation of Highest Astronomical Tide above MSL (1983-2001) at the station shown.
  • LAT83 is the elevation of Lowest Astronomical Tide below MSL (1983-2001) at the station shown.
  • MHHW, MSL, and MLLW are the tidal datums of Mean Higher High Water, Mean Sea Level, and Mean Lower Low Water as defined by NOAA/NOS for the 1983-2001 National Tidal Datum Epoch (See http://tidesandcurrents.noaa.gov).

For a more extensive explanation, read "What is Extratidal High or Low Water?" (pdf).

Read our Disclaimer and Methods Disclosure document (pdf).