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 163
Newest spectrum
29 min ago
Systems named
303
Swell · wind sea
203 · 100
Seas crossing
7 buoys
Storms, last month
192 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 4 m); 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 sea0.5 m10 sE new
  • Groundswell0.3 m13 sESE ↑ building
Bethany Beach, DE 44084 · Eastern Seaboard North · 29 min ago
  • Swell0.5 m10 sE ↑ building
About 1900 nmi to the ENE (069°T)
Block Island, RI (154) 44097 · Eastern Seaboard North · 29 min ago
  • Swell0.5 m10 sESE
  • Wind sea0.3 m4 sE new
Boston, MA 44013 · Eastern Seaboard North · 39 min ago
  • Swell0.8 m9 sE
  • Swell0.2 m5 sNE new
About 750 nmi to the ENE (071°T)
Buzzards Bay, MA (260) 44085 · Eastern Seaboard North · 1 h ago
  • Wind sea0.4 m8 sS ↑ building
Cape Cod Bay, MA (221) 44090 · Eastern Seaboard North · 1 h ago
  • Wind sea0.2 m10 sENE new
Cape Henry, VA 44099 · Eastern Seaboard North · 29 min ago
  • Swell0.4 m9 sE
  • Groundswell0.2 m14 sESE ↓ fading
About 2300 nmi to the NE (051°T)
Georges Bank, MA 44011 · Eastern Seaboard North · 39 min ago
  • Swell0.8 m8 sE
  • Swell0.8 m6 sW ↓ fading
Jeffrey's Ledge, NH 44098 · Eastern Seaboard North · 1 h ago
  • Wind sea0.9 m8 sE
Jonesport, ME 44027 · Eastern Seaboard North · 39 min ago
  • Swell0.4 m7 sS
  • Swell0.2 m4 sENE ↑ building
  • Swell0.2 m8 sENE new
Long Island, NY 44025 · Eastern Seaboard North · 49 min ago
  • Swell0.6 m10 sE
  • Groundswell0.2 m13 sSSE new
Nantucket Offshore, MA 44008 · Eastern Seaboard North · 1 h ago
  • Swell0.8 m9 sENE ↓ fading
  • Swell0.4 m5 sWSW ↑ building
  • Swell0.3 m13 sSE new
  • +1 more
Nantucket Sound, MA 44020 · Eastern Seaboard North · 39 min ago
  • Swell0.2 m5 sENE ↓ fading
New York Harbor Entrance, NY 44065 · Eastern Seaboard North · 39 min ago
  • Swell0.5 m10 sESE
Portland, ME 44007 · Eastern Seaboard North · 1 h ago
  • Swell0.7 m8 sESE ↑ building
Thimble Shoal, VA 44087 · Eastern Seaboard North · 29 min ago
  • Swell0.2 m9 sE new
Virginia Beach Offshore, VA 44088 · Eastern Seaboard North · 1 h ago
  • Wind sea0.6 m9 sE
  • Groundswell0.3 m14 sESE ↑ building
Virginia Beach, VA 44014 · Eastern Seaboard North · 39 min ago
  • Swell0.6 m8 sESE ↑ building