Many stations on the Gulf coast have large values for September 1961.
Documentation added 1994-07-12
For a description of Key West data dating back to 1846, see MAUL, G.A. & MARTIN, D.M. 1993, Sea level rise at Key West, Florida, 1846-1992: America's longest instrument record? Geophysical Research Letters, 20(18), 1955-1958.
Documentation added 2011-07-27
Data is downloaded directly from the NOAA website. Datum information also downloaded. The NOAA Primary Benchmark is 4580 E 1998 3.116m above TGZ.