Mean High Water Neaps (MHWN) (MHWN)

The average height of the two successive high waters during neap-tide periods at a stated location and over a defined observation period.

MHWN is a tidal datum derived from observations or predictions using the hydrographic authority’s specified method. It is associated with smaller astronomical tidal ranges but is not the height of every high water during a neap period. The value is local and must be used with its stated datum and source. Weather and other non-tidal effects can make observed high water differ from MHWN, and the term is not interchangeable with Mean High Water or Mean High Water Springs.