Secondary wave systems create a more confused surf zone. with a large range of
breaker heights and breaker periods, and littoral currents that may be erratic.
The Modified Surf Index (MSI) provides an objective decision aid for amphibious
planners that assesses the combined effects of breakers, littoral currents, and
winds on landing craft.
The SURF program.
The most recent trends in the Modified Surf Index should be evaluated along with
current meteorological parameters, such as wind and sea state.
The Commander, Amphibious Task Force (CATF), the command ship weather
office, and the Naval Meteorology and Oceanography Command assigned
forecast responsibilities for the operation.
A28. To transmit SUROB information via voice or flashing light when speed is
A rising tide (high tide).
A falling tide (low tide).
The surf zone is normally wider at low tidesince the water level is lower and waves
will begin to interact with the bottom farther from the shore.
Tidal information can be obtainedfrom Quartermaster personnel, publications,
prepared tables, charts, and the TIDE program in TESS/MOSS.