Bluegraph
SIMarineUS

Wave intelligence

The systems in the sea

A buoy's significant wave height sums everything in the sea: long groundswell from a storm a thousand miles off, a closer swell, the chop of the local wind. Each buoy's measured directional spectrum is partitioned into those systems, which are followed through time, used to place the storms the swells came from, and checked for seas that cross.

Stations analysed
161 of 162
Newest spectrum
32 min ago
Systems named
306
Swell · wind sea
208 · 98
Seas crossing
10 buoys
Storms, last month
170 placed →
Window
The last 4 days
Method
Reference

Swells whose arrival places the storm that raised them, found over the last four days: how far off it was, in which direction, and when the waves left.

Each petal is a system, pointing to where it comes from, north up. Its length grows with height (the ring is 4 m); its width is the directional spread. Swell Wind sea Storm placed

StationWhere the swell came from
South Bermuda 41049 · Eastern Seaboard South · 1 h agoAbout 1300 nmi to the NE (037°T)Waves left about 23 Sep 22Z · Swell peaking at 1.4 m
Duck FRF, NC 44056 · Eastern Seaboard South · 1 h agoAbout 2050 nmi to the ENE (057°T)Waves left about 22 Sep 02Z · Swell peaking at 3.4 m
Duck FRF 26 m, NC 44100 · Eastern Seaboard South · 32 min agoAbout 2600 nmi to the ENE (060°T)Waves left about 20 Sep 23Z · Swell peaking at 4.1 m
Cape Hatteras East, NC (250) 41120 · Eastern Seaboard South · 1 h agoAbout 3200 nmi to the ENE (057°T)Waves left about 19 Sep 17Z · Swell peaking at 4.7 m