sea · waves, temperature and ice
Swell
The primary swell as a field: the long, regular waves that travelled in from a distant storm, apart from the local wind sea.
What it shows
The primary swell as a field: the long, regular waves that travelled in from a distant storm, apart from the local wind sea. The readout gives height and period, arrows show where it is going and a tap tells the direction it comes from.
Where the data comes from
NOAA WaveWatch III via the GFS-wave model (public domain), baked on our server every hour from 24 h ago to 48 h ahead in 3-hour steps; sea points only.
Reading the map
Same scale as sea state: blue under 1.25 m, indigo at 2.5 m, violet at 4 m, red from 6 m, dark red at 11 m.
Units Metres of swell height; period in seconds; direction in compass points and degrees.
Put this map on your site
Writing about it? Embed this live map: one iframe, free, no tracking, it stays up to date on its own.