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
36 min ago
Systems named
324
Swell · wind sea
211 · 113
Seas crossing
5 buoys
Storms, last month
232 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
Red Beach Nearshore 46275 · California · 1 h agoAbout 700 nmi to the W (267°T)Waves left about 29 Sep 11Z · Swell peaking at 0.6 m
NE St Martin 41044 · Caribbean and tropical Atlantic · 46 min agoAbout 900 nmi to the NE (039°T)Waves left about 28 Sep 15Z · Swell peaking at 1.2 m · 2 storms in all
W Aleutians (Amchitka), AK 46071 · Alaska · 46 min agoAbout 600 nmi to the S (180°T)Waves left about 28 Sep 10Z · Swell peaking at 0.5 m
Edisto, SC 41004 · Eastern Seaboard South · 46 min agoAbout 700 nmi to the ESE (105°T)Waves left about 28 Sep 05Z · Swell peaking at 0.6 m
Fairweather Ground, AK 46083 · Alaska · 46 min agoAbout 400 nmi to the WSW (244°T)Waves left about 27 Sep 21Z · Swell peaking at 3.1 m
NW Hawaii - 200 NM NW of Kauai 51001 · Hawaii · 46 min agoAbout 800 nmi to the S (180°T)Waves left about 27 Sep 16Z · Swell peaking at 2.0 m
Clatsop Spit, OR 46243 · Pacific Northwest · 1 h agoAbout 650 nmi to the W (263°T)Waves left about 27 Sep 15Z · Groundswell peaking at 1.4 m
Neah Bay, WA 46087 · Pacific Northwest · 2 h agoAbout 550 nmi to the W (268°T)Waves left about 27 Sep 12Z · Swell peaking at 1.9 m
Torrey Pines Outer, CA 46225 · California · 1 h agoAbout 1550 nmi to the W (267°T)Waves left about 27 Sep 12Z · Swell peaking at 0.9 m
Mission Bay West, CA 46258 · California · 36 min agoAbout 1650 nmi to the WSW (247°T)Waves left about 27 Sep 08Z · Groundswell peaking at 1.5 m
Harvest, CA (071) 46218 · California · 36 min agoAbout 1450 nmi to the NW (306°T)Waves left about 26 Sep 22Z · Groundswell peaking at 2.3 m
Point Loma South, CA 46232 · California · 36 min agoAbout 1900 nmi to the WSW (247°T)Waves left about 26 Sep 21Z · Groundswell peaking at 1.2 m
South Bermuda 41049 · Eastern Seaboard South · 46 min agoAbout 1650 nmi to the NNE (033°T)Waves left about 26 Sep 20Z · Groundswell peaking at 1.4 m
North Equatorial Two 41041 · Caribbean and tropical Atlantic · 46 min agoAbout 2200 nmi to the NNE (015°T)Waves left about 26 Sep 20Z · Groundswell peaking at 1.4 m
Cape San Martin, CA 46028 · California · 46 min agoAbout 1400 nmi to the NNW (330°T)Waves left about 26 Sep 18Z · Groundswell peaking at 2.7 m
Bodega Bay, CA 46013 · California · 46 min agoAbout 1300 nmi to the WNW (302°T)Waves left about 26 Sep 18Z · Groundswell peaking at 2.5 m
Boston, MA 44013 · Eastern Seaboard North · 46 min 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 1100 nmi to the S (188°T)Waves left about 26 Sep 17Z · Swell peaking at 1.6 m
Western Caribbean 42057 · Caribbean and tropical Atlantic · 46 min agoAbout 350 nmi to the ESE (114°T)Waves left about 26 Sep 17Z · Swell peaking at 0.8 m
San Nicolas Island, CA 46219 · California · 36 min agoAbout 1800 nmi to the NW (308°T)Waves left about 26 Sep 13Z · Groundswell peaking at 2.5 m