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
NW Hawaii - 200 NM NW of Kauai 51001 · Hawaii · 49 min agoAbout 900 mi to the S (180°T)Waves left about 27 Sep 17Z · Swell peaking at 7.7 ft
Barbers Point, Kalaeloa, HI (238) 51212 · Hawaii · 1 h agoAbout 1300 mi to the S (188°T)Waves left about 26 Sep 16Z · Swell peaking at 5.4 ft
Northwestern Hawaii Two 51101 · Hawaii · 49 min agoAbout 1500 mi to the SSE (152°T)Waves left about 26 Sep 12Z · Swell peaking at 11.9 ft
SW Hawaii - 200 NM SW of Kona 51002 · Hawaii · 49 min agoAbout 2450 mi to the NW (306°T)Waves left about 25 Sep 07Z · Swell peaking at 4.6 ft
SE Hawaii - 200 NM SE of Hilo 51004 · Hawaii · 49 min agoAbout 2750 mi to the NNW (345°T)Waves left about 24 Sep 22Z · Groundswell peaking at 7.5 ft · 2 storms in all
Hilo, HI 51206 · Hawaii · 39 min agoAbout 2550 mi to the NNW (328°T)Waves left about 24 Sep 22Z · Groundswell peaking at 2.9 ft