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
33 min ago
Systems named
308
Swell · wind sea
206 · 102
Seas crossing
10 buoys
Storms, last month
221 placed →
Window
The last 4 days
Method
Reference

Every buoy by how orderly its largest system is: a narrow directional spread means long crests, as in groundswell; a wide one, short, confused seas.

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

StationLargest systemDirectional spread
North Point, Pohnpei 52213 · Pacific islands · 1 h agoWind sea 8 s 36° moderate crests
Aunuu, American Samoa 51209 · Pacific islands · 53 min agoWind sea 8 s 41° short, confused crests
Pikareej, Arno Atoll, Marshall Islands 52216 · Pacific islands · 1 h agoGroundswell 14 s 43° short, confused crests
Rumung, Yap 52214 · Pacific islands · 53 min agoWind sea 5 s 56° short, confused crests
King-Poloa, American Samoa 51214 · Pacific islands · 53 min agoWind sea 9 s 57° short, confused crests
Ngaraard, Palau 52212 · Pacific islands · 53 min agoWind sea 10 s 59° short, confused crests