Spring Tide

A period in the astronomical tidal cycle when the range between successive high and low waters is relatively large.

Springs generally occur near new and full moon when lunar and solar tide-generating effects reinforce one another. The name refers to the tide springing or rising more strongly and has no connection with the season of spring.

Local geography and shallow-water effects mean the greatest range may lag the lunar alignment and varies between cycles. Spring tides often produce stronger tidal streams, but weather, river flow, depth and channel form can materially alter observed levels and current.