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
162 of 164
Newest spectrum
35 min ago
Systems named
309
Swell · wind sea
208 · 101
Seas crossing
9 buoys
Storms, last month
219 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
W Aleutians (Amchitka), AK 46071 · Alaska · 45 min agoAbout 600 nmi to the S (178°T)Waves left about 28 Sep 10Z · Swell peaking at 0.5 m
Fairweather Ground, AK 46083 · Alaska · 45 min agoAbout 400 nmi to the WSW (244°T)Waves left about 27 Sep 21Z · Swell peaking at 3.1 m
West Orca Bay, AK 46060 · Alaska · 45 min agoAbout 650 nmi to the S (180°T)Waves left about 27 Sep 02Z · Swell peaking at 0.5 m
Central Aleutians, AK 46072 · Alaska · 45 min agoAbout 300 nmi to the NNW (331°T)Waves left about 26 Sep 18Z · Swell peaking at 2.0 m
Cape Edgecumbe, AK 46084 · Alaska · 45 min agoAbout 650 nmi to the WSW (241°T)Waves left about 26 Sep 05Z · Swell peaking at 4.2 m
Central Bering Sea, AK Offshore 46035 · Alaska · 45 min agoAbout 1050 nmi to the SW (222°T)Waves left about 24 Sep 16Z · Swell peaking at 1.0 m
Portlock Bank, AK 46080 · Alaska · 45 min agoAbout 1900 nmi to the SSW (208°T)Waves left about 24 Sep 02Z · Swell peaking at 2.4 m
Albatross Bank, AK 46078 · Alaska · 45 min agoAbout 1800 nmi to the WSW (241°T)Waves left about 23 Sep 20Z · Swell peaking at 4.8 m
W Gulf of Alaska 46001 · Alaska · 1 h agoAbout 2150 nmi to the WSW (240°T)Waves left about 23 Sep 05Z · Swell peaking at 4.1 m
Cape Suckling, AK 46082 · Alaska · 45 min agoAbout 2500 nmi to the SSW (213°T)Waves left about 23 Sep 01Z · Swell peaking at 2.8 m