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 164
Newest spectrum
1 h ago
Systems named
306
Swell · wind sea
208 · 98
Seas crossing
6 buoys
Storms, last month
202 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
Grays Reef, GA 41008 · Eastern Seaboard South · 1 h agoAbout 800 nmi to the E (086°T)Waves left about 29 Sep 02Z · Groundswell peaking at 0.4 m
East Bahamas 41046 · Caribbean and tropical Atlantic · 1 h agoAbout 850 nmi to the ENE (066°T)Waves left about 28 Sep 23Z · Groundswell peaking at 1.2 m · 2 storms in all
Portland, ME 44007 · Eastern Seaboard North · 1 h agoAbout 600 nmi to the ESE (115°T)Waves left about 28 Sep 16Z · Swell peaking at 0.9 m
Santa Monica Basin, CA 46025 · California · 1 h agoAbout 950 nmi to the SW (231°T)Waves left about 28 Sep 16Z · Groundswell peaking at 0.7 m
South Bermuda 41049 · Eastern Seaboard South · 1 h agoAbout 1000 nmi to the NE (035°T)Waves left about 28 Sep 02Z · Groundswell peaking at 1.4 m
Fairweather Ground, AK 46083 · Alaska · 1 h agoAbout 400 nmi to the WSW (244°T)Waves left about 27 Sep 21Z · Swell peaking at 3.1 m · 2 storms in all
NW Hawaii - 200 NM NW of Kauai 51001 · Hawaii · 1 h agoAbout 800 nmi to the S (180°T)Waves left about 27 Sep 16Z · Swell peaking at 2.0 m
South Hatteras 41002 · Eastern Seaboard South · 1 h agoAbout 600 nmi to the SE (145°T)Waves left about 27 Sep 03Z · Swell peaking at 0.7 m
Onslow Bay Outer, NC (217) 41159 · Eastern Seaboard South · 1 h agoAbout 1650 nmi to the ESE (106°T)Waves left about 26 Sep 23Z · Groundswell peaking at 0.4 m
Harvest, CA (071) 46218 · California · 1 h agoAbout 1450 nmi to the NW (305°T)Waves left about 26 Sep 23Z · Groundswell peaking at 2.3 m
Bodega Bay, CA 46013 · California · 1 h agoAbout 1300 nmi to the WNW (302°T)Waves left about 26 Sep 18Z · Groundswell peaking at 2.7 m
Boston, MA 44013 · Eastern Seaboard North · 1 h agoAbout 750 nmi to the ENE (071°T)Waves left about 26 Sep 17Z · Swell peaking at 2.0 m
Barbers Point, Kalaeloa, HI (238) 51212 · Hawaii · 1 h agoAbout 1150 nmi to the S (188°T)Waves left about 26 Sep 16Z · Swell peaking at 1.6 m
Point Arena, CA 46014 · California · 1 h agoAbout 1350 nmi to the WNW (291°T)Waves left about 26 Sep 12Z · Groundswell peaking at 1.4 m
Northwestern Hawaii Two 51101 · Hawaii · 1 h agoAbout 1300 nmi to the SSE (152°T)Waves left about 26 Sep 12Z · Swell peaking at 3.6 m · 2 storms in all
West California 46059 · California · 1 h agoAbout 900 nmi to the SSE (151°T)Waves left about 26 Sep 10Z · Groundswell peaking at 0.9 m · 2 storms in all
Port Orford, OR 46015 · Pacific Northwest · 1 h agoAbout 750 nmi to the NW (317°T)Waves left about 26 Sep 08Z · Swell peaking at 1.1 m · 2 storms in all
Diablo Canyon, CA 46215 · California · 1 h agoAbout 1600 nmi to the WSW (239°T)Waves left about 26 Sep 07Z · Groundswell peaking at 2.3 m
Stonewall Bank, OR 46050 · Pacific Northwest · 1 h agoAbout 750 nmi to the W (268°T)Waves left about 26 Sep 06Z · Swell peaking at 0.9 m
Cape Edgecumbe, AK 46084 · Alaska · 1 h agoAbout 700 nmi to the WSW (245°T)Waves left about 26 Sep 01Z · Swell peaking at 4.2 m