NOAA Tides & Currents (CO-OPS)

6-minute observations from ~210 tide gauges, plus 15-minute meteorological obs at co-located stations. Authoritative source for coastal storm-surge validation and parametric storm-surge triggers.

Provider	NOAA CO-OPS
Delivery mode	stream
CNR score	80
Cadence	PT6M
Origin	https://tidesandcurrents.noaa.gov/