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
39 min ago
Systems named
311
Swell · wind sea
212 · 99
Seas crossing
7 buoys
Storms, last month
197 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 13 ft); its width is the directional spread. Swell Wind sea Storm placed

StationWhere the swell came from
Fairweather Ground, AK 46083 · Alaska · 49 min agoAbout 450 mi to the WSW (244°T)Waves left about 27 Sep 21Z · Swell peaking at 10.1 ft · 2 storms in all
Seal Rocks, AK 46061 · Alaska · 49 min agoAbout 500 mi to the SE (131°T)Waves left about 27 Sep 19Z · Swell peaking at 2.6 ft
West Orca Bay, AK 46060 · Alaska · 49 min agoAbout 750 mi to the S (180°T)Waves left about 27 Sep 02Z · Swell peaking at 1.7 ft
Cape Edgecumbe, AK 46084 · Alaska · 49 min agoAbout 800 mi to the WSW (245°T)Waves left about 26 Sep 01Z · Swell peaking at 13.6 ft
Central Gulf of Alaska 46085 · Alaska · 49 min agoAbout 800 mi to the WSW (243°T)Waves left about 25 Sep 12Z · Swell peaking at 13.3 ft
Portlock Bank, AK 46080 · Alaska · 49 min agoAbout 2450 mi to the SSW (207°T)Waves left about 23 Sep 11Z · Swell peaking at 7.8 ft
Albatross Bank, AK 46078 · Alaska · 49 min agoAbout 2550 mi to the WSW (238°T)Waves left about 22 Sep 15Z · Swell peaking at 17.2 ft