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
27 min ago
Systems named
316
Swell · wind sea
240 · 76
Seas crossing
7 buoys
Storms, last month
211 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
Virginia Beach, VA 44014 · Eastern Seaboard North · 1 h agoSwell 9 s 35° moderate crests
New York Harbor Entrance, NY 44065 · Eastern Seaboard North · 1 h agoSwell 9 s 36° moderate crests
Virginia Beach Offshore, VA 44088 · Eastern Seaboard North · 1 h agoWind sea 9 s 36° moderate crests
Jeffrey's Ledge, NH 44098 · Eastern Seaboard North · 1 h agoWind sea 10 s 38° moderate crests
Portland, ME 44007 · Eastern Seaboard North · 1 h agoSwell 10 s 43° short, confused crests
Buzzards Bay, MA (260) 44085 · Eastern Seaboard North · 1 h agoWind sea 7 s 48° short, confused crests
Jonesport, ME 44027 · Eastern Seaboard North · 1 h agoSwell 7 s 49° short, confused crests
Nantucket Offshore, MA 44008 · Eastern Seaboard North · 1 h agoSwell 8 s 49° short, confused crests
Georges Bank, MA 44011 · Eastern Seaboard North · 1 h agoSwell 8 s 55° short, confused crests
Barnegat, NJ (209) 44091 · Eastern Seaboard North · 1 h agoWind sea 9 s 60° short, confused crests
Bethany Beach, DE 44084 · Eastern Seaboard North · 27 min agoSwell 10 s 81° short, confused crests
Block Island, RI (154) 44097 · Eastern Seaboard North · 1 h agoSwell 12 s 81° short, confused crests
Boston, MA 44013 · Eastern Seaboard North · 1 h agoSwell 10 s 81° short, confused crests
Cape Cod Bay, MA (221) 44090 · Eastern Seaboard North · 2 h agoWind sea 2 s 81° short, confused crests
Cape Henry, VA 44099 · Eastern Seaboard North · 27 min agoSwell 12 s 81° short, confused crests
Long Island, NY 44025 · Eastern Seaboard North · 1 h agoSwell 11 s 81° short, confused crests
Nantucket Sound, MA 44020 · Eastern Seaboard North · 1 h agoSwell 8 s 81° short, confused crests
Thimble Shoal, VA 44087 · Eastern Seaboard North · 27 min agoSwell 3 s 81° short, confused crests