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 164
Newest spectrum
43 min ago
Systems named
305
Swell · wind sea
206 · 99
Seas crossing
8 buoys
Storms, last month
215 placed →
Window
The last 4 days
Method
Reference

Buoys where the two largest systems now meet at 40° or more with comparable energy, in seas of 1.5 m or more: steeper, less regular waves than the height alone suggests.

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

StationCrossingSystems
Central Aleutians, AK 46072 · Alaska · 43 min ago 140° apartthe smaller holds 56% of the larger's energy
  • Wind sea3.2 m8 sNE
  • Swell2.4 m11 sSSW ↓ fading
Western Hawaii 51003 · Hawaii · 43 min ago 120° apartthe smaller holds 85% of the larger's energy
  • Swell1.3 m9 sWNW ↑ building
  • Wind sea1.2 m5 sS
  • Swell1.1 m11 sSE new
  • +1 more
SE Hawaii - 200 NM SE of Hilo 51004 · Hawaii · 43 min ago 115° apartthe smaller holds 47% of the larger's energy
  • Swell1.4 m9 sE
  • Groundswell1.0 m14 sSSW ↑ building
  • Swell0.6 m10 sW ↑ building
  • +1 more
W Aleutians (Amchitka), AK 46071 · Alaska · 43 min ago 80° apartthe smaller holds 94% of the larger's energy
  • Swell2.0 m11 sSW ↓ fading
  • Swell1.9 m11 sSSE new
Central Caribbean 42058 · Caribbean and tropical Atlantic · 43 min ago 65° apartthe smaller holds 39% of the larger's energy
  • Wind sea1.6 m7 sE ↓ fading
  • Swell1.0 m8 sNE new
West Washington 46005 · Pacific Northwest · 43 min ago 60° apartthe smaller holds 98% of the larger's energy
  • Swell1.2 m11 sWNW
  • Wind sea1.2 m6 sSW ↓ fading
Central Gulf of Alaska 46085 · Alaska · 43 min ago 60° apartthe smaller holds 52% of the larger's energy
  • Swell1.9 m8 sW ↓ fading
  • Wind sea1.4 m8 sSW new
West California 46059 · California · 43 min ago 60° apartthe smaller holds 92% of the larger's energy
  • Swell1.4 m11 sNW
  • Wind sea1.3 m6 sN ↑ building