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 163
Newest spectrum
29 min ago
Systems named
307
Swell · wind sea
208 · 99
Seas crossing
2 buoys
Storms, last month
199 placed →
Window
The last 4 days
Method
Reference

The wave systems in each buoy's latest spectrum, largest first, and whether each is building or fading.

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

StationSystems nowSeas crossingStorm placed
Barnegat, NJ (209) 44091 · Eastern Seaboard North · 1 h ago
  • Wind sea2.1 ft9 sE ↑ building
Bethany Beach, DE 44084 · Eastern Seaboard North · 29 min ago
  • Swell1.2 ft13 sESE new
  • Wind sea1.0 ft10 sNE ↓ fading
About 3200 mi to the ENE (072°T)
Block Island, RI (154) 44097 · Eastern Seaboard North · 1 h ago
  • Wind sea1.9 ft10 sSE
Boston, MA 44013 · Eastern Seaboard North · 39 min ago
  • Swell1.5 ft9 sE ↓ fading
  • Swell0.9 ft4 sNE new
  • Swell0.7 ft12 sNE new
About 850 mi to the ENE (072°T)
Buzzards Bay, MA (260) 44085 · Eastern Seaboard North · 1 h ago
  • Wind sea1.4 ft8 sS ↑ building
Cape Cod Bay, MA (221) 44090 · Eastern Seaboard North · 1 h agoCalm: no wave system large enough to name
Cape Henry, VA 44099 · Eastern Seaboard North · 29 min ago
  • Swell1.3 ft12 sESE ↑ building
  • Wind sea1.2 ft9 sE ↓ fading
Georges Bank, MA 44011 · Eastern Seaboard North · 39 min ago
  • Swell3.3 ft9 sE
  • Wind sea2.3 ft5 sNW
Jeffrey's Ledge, NH 44098 · Eastern Seaboard North · 1 h ago
  • Wind sea2.5 ft9 sESE
Jonesport, ME 44027 · Eastern Seaboard North · 39 min ago
  • Swell1.5 ft7 sS ↓ fading
  • Swell0.7 ft4 sENE new
Long Island, NY 44025 · Eastern Seaboard North · 49 min ago
  • Swell2.0 ft9 sE
Nantucket Offshore, MA 44008 · Eastern Seaboard North · 1 h ago
  • Swell3.2 ft9 sENE ↑ building
  • Swell1.1 ft5 sSW
Nantucket Sound, MA 44020 · Eastern Seaboard North · 39 min ago
  • Swell0.6 ft9 sE ↓ fading
New York Harbor Entrance, NY 44065 · Eastern Seaboard North · 39 min ago
  • Swell1.6 ft9 sE
  • Wind sea0.8 ft2 sS new
  • Swell0.7 ft13 sSE new
Portland, ME 44007 · Eastern Seaboard North · 39 min ago
  • Swell1.3 ft9 sSE new
  • Swell1.2 ft6 sESE ↓ fading
About 650 mi to the ESE (114°T)
Thimble Shoal, VA 44087 · Eastern Seaboard North · 29 min ago
  • Wind sea1.0 ft3 sSE new
Virginia Beach Offshore, VA 44088 · Eastern Seaboard North · 1 h ago
  • Swell1.9 ft13 sESE ↑ building
  • Wind sea1.3 ft9 sNE ↓ fading
About 4900 mi to the ESE (102°T)
Virginia Beach, VA 44014 · Eastern Seaboard North · 1 h ago
  • Swell1.8 ft12 sESE ↑ building
  • Swell1.1 ft9 sNE
  • Swell0.6 ft4 sSE new
About 700 mi to the S (177°T)