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
34 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

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 13 ft); its width is the directional spread. Swell Wind sea Storm placed

StationWhere the swell came from
Portland, ME 44007 · Eastern Seaboard North · 34 min agoAbout 650 mi to the ESE (114°T)Waves left about 28 Sep 16Z · Swell peaking at 3.1 ft
Boston, MA 44013 · Eastern Seaboard North · 34 min agoAbout 850 mi to the ENE (072°T)Waves left about 26 Sep 17Z · Swell peaking at 6.6 ft
Virginia Beach, VA 44014 · Eastern Seaboard North · 34 min agoAbout 650 mi to the S (177°T)Waves left about 26 Sep 01Z · Swell peaking at 1.8 ft · 2 storms in all
Nantucket Offshore, MA 44008 · Eastern Seaboard North · 34 min agoAbout 1350 mi to the SSW (205°T)Waves left about 24 Sep 07Z · Swell peaking at 9.7 ft
Barnegat, NJ (209) 44091 · Eastern Seaboard North · 54 min agoAbout 7750 mi to the ESE (120°T)Waves left about 16 Sep 14Z · Groundswell peaking at 1.9 ft