NDBC GDMM5 · Tide gauge · Great Lakes

Grand Marais, Lake Superior, MN

47°44.9′N 090°20.5′W

Reading the gauge's spectra from NDBC…

At the shore, at this coastline's 1:10m scale 58 nmi SW of Thunder Bay Coastline: Natural Earth · places: GeoNames

A simulation of the sea at this gauge, built from its wave measurements. The wave heights, periods and directions are real; the exact position of each crest is not. How it is made

This page is drawn by script. The CSV and JSON downloads have every observation.

Every measurement · last 48 hours

What the gauge reports

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