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
38 min ago
Systems named
339
Swell · wind sea
231 · 108
Seas crossing
5 buoys
Storms, last month
229 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 · 38 min agoAbout 1400 km to the S (180°T)Waves left about 27 Sep 17Z · Swell peaking at 2.4 m · 2 storms in all
Barbers Point, Kalaeloa, HI (238) 51212 · Hawaii · 58 min agoAbout 2050 km to the S (188°T)Waves left about 26 Sep 17Z · Swell peaking at 1.6 m
Northwestern Hawaii Two 51101 · Hawaii · 38 min agoAbout 2450 km to the SSE (152°T)Waves left about 26 Sep 11Z · Swell peaking at 3.6 m · 3 storms in all
Pauwela, Maui, HI 51205 · Hawaii · 58 min agoAbout 2750 km to the NW (325°T)Waves left about 26 Sep 01Z · Swell peaking at 1.5 m
SW Hawaii - 200 NM SW of Kona 51002 · Hawaii · 38 min agoAbout 3850 km to the NW (305°T)Waves left about 25 Sep 10Z · Swell peaking at 1.4 m
SE Hawaii - 200 NM SE of Hilo 51004 · Hawaii · 38 min agoAbout 4200 km to the N (354°T)Waves left about 25 Sep 04Z · Groundswell peaking at 1.1 m
Hilo, HI 51206 · Hawaii · 58 min agoAbout 4100 km to the NNW (327°T)Waves left about 24 Sep 22Z · Groundswell peaking at 0.8 m