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 163
Newest spectrum
41 min ago
Systems named
296
Swell · wind sea
202 · 94
Seas crossing
2 buoys
Storms, last month
181 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
NW Hawaii - 200 NM NW of Kauai 51001 · Hawaii · 1 h agoAbout 750 nmi to the S (180°T)Waves left about 27 Sep 17Z · Swell peaking at 2.4 m
Barbers Point, Kalaeloa, HI (238) 51212 · Hawaii · 1 h agoAbout 1100 nmi to the S (187°T)Waves left about 26 Sep 17Z · Swell peaking at 1.6 m
Northwestern Hawaii Two 51101 · Hawaii · 51 min agoAbout 1350 nmi to the SSE (147°T)Waves left about 26 Sep 10Z · Swell peaking at 3.6 m
SE Hawaii - 200 NM SE of Hilo 51004 · Hawaii · 51 min agoAbout 2250 nmi to the NNW (342°T)Waves left about 25 Sep 04Z · Groundswell peaking at 2.3 m
Hilo, HI 51206 · Hawaii · 41 min agoAbout 2200 nmi to the NNW (326°T)Waves left about 24 Sep 22Z · Groundswell peaking at 0.8 m
Pauwela, Maui, HI 51205 · Hawaii · 41 min agoAbout 2550 nmi to the NW (325°T)Waves left about 24 Sep 04Z · Groundswell peaking at 1.5 m