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
160 of 163
Newest spectrum
38 min ago
Systems named
309
Swell · wind sea
210 · 99
Seas crossing
6 buoys
Storms, last month
196 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 1200 nmi to the NE (042°T)Waves left about 27 Sep 17Z · Groundswell peaking at 1.4 m
South Hatteras 41002 · Eastern Seaboard South · 1 h agoAbout 500 nmi to the SSE (148°T)Waves left about 27 Sep 11Z · Swell peaking at 0.7 m
Diamond Shoals, NC 41025 · Eastern Seaboard South · 1 h agoAbout 350 nmi to the NNE (021°T)Waves left about 26 Sep 20Z · Swell peaking at 1.2 m
Cape Hatteras East, NC (250) 41120 · Eastern Seaboard South · 38 min agoAbout 850 nmi to the NE (048°T)Waves left about 25 Sep 01Z · Swell peaking at 2.4 m
Duck FRF, NC 44056 · Eastern Seaboard South · 1 h agoAbout 1500 nmi to the NE (053°T)Waves left about 23 Sep 13Z · Swell peaking at 2.5 m
St. Augustine, FL (194) 41117 · Eastern Seaboard South · 1 h agoAbout 3050 nmi to the ENE (062°T)Waves left about 21 Sep 14Z · Swell peaking at 1.4 m
Fernandina Beach, FL Offshore 41112 · Eastern Seaboard South · 1 h agoAbout 3500 nmi to the E (086°T)Waves left about 20 Sep 13Z · Swell peaking at 0.9 m
Masonboro Inlet, ILM2, NC (150) 41110 · Eastern Seaboard South · 1 h agoAbout 4700 nmi to the ESE (105°T)Waves left about 16 Sep 00Z · Swell peaking at 0.6 m