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On Saturday, June 23rd, 2018 starting at 7:30 a.m to 8 p.m. EDT, there will be a system maintenance performed affecting the Tides and Currents web site ( During this time, the Tides and Currents website will be running with limited capabilities. Click here for more information.

Extreme Exceedance Probability Levels

The graphs compare the 10% and 1% annual exceedance probability levels which correspond to the levels that would be exceeded ten times and one time per century. The high exceedance probability levels are in meters above Mean Higher High Water (MHHW) and the low exceedance probability levels are in meters below Mean Lower Low Water (MLLW).


Revised: 10/15/2013
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services