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
151 of 156
Newest spectrum
44 min ago
Systems named
269
Swell · wind sea
155 · 114
Seas crossing
27 buoys
Storms, last month
659 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 sea2.5 m8 sENE
About 4350 nmi to the SE (128°T)
Bethany Beach, DE 44084 · Eastern Seaboard North · 44 min ago
  • Wind sea0.5 m7 sE ↓ fading
About 3100 nmi to the ESE (111°T)
Block Island, RI (154) 44097 · Eastern Seaboard North · 1 h ago
  • Wind sea3.0 m8 sE
Boston, MA 44013 · Eastern Seaboard North · 2 h ago
  • Wind sea2.6 m7 sESE ↑ building
Buzzards Bay, MA (260) 44085 · Eastern Seaboard North · 1 h ago
  • Wind sea1.6 m4 sE
Cape Cod Bay, MA (221) 44090 · Eastern Seaboard North · 1 h ago
  • Wind sea1.2 m5 sENE
Cape Henry, VA 44099 · Eastern Seaboard North · 44 min ago
  • Wind sea1.1 m4 sWNW new
About 5450 nmi to the ESE (107°T)
Georges Bank, MA 44011 · Eastern Seaboard North · 1 h ago
  • Swell3.0 m8 sE
Jeffrey's Ledge, NH 44098 · Eastern Seaboard North · 1 h ago
  • Wind sea2.3 m7 sE ↑ building
Jonesport, ME 44027 · Eastern Seaboard North · 1 h ago
  • Wind sea0.7 m4 sNE new
  • Swell0.3 m4 sE new
  • Swell0.3 m7 sSSE
Long Island, NY 44025 · Eastern Seaboard North · 2 h ago
  • Swell2.9 m8 sE
  • Swell1.1 m8 sNNE new
About 450 nmi to the S (177°T)
Nantucket Offshore, MA 44008 · Eastern Seaboard North · 1 h ago
  • Wind sea3.3 m8 sENE
Nantucket Sound, MA 44020 · Eastern Seaboard North · 1 h ago
  • Wind sea1.6 m5 sE
New York Harbor Entrance, NY 44065 · Eastern Seaboard North · 1 h ago
  • Swell2.3 m8 sE
Portland, ME 44007 · Eastern Seaboard North · 1 h ago
  • Swell1.2 m5 sESE
  • Wind sea0.6 m3 sNE new
Thimble Shoal, VA 44087 · Eastern Seaboard North · 44 min ago
  • Wind sea0.6 m3 sNW new
Virginia Beach Offshore, VA 44088 · Eastern Seaboard North · 1 h ago
  • Wind sea1.8 m5 sWSW new
About 5650 nmi to the ESE (118°T)
Virginia Beach, VA 44014 · Eastern Seaboard North · 1 h ago
  • Swell1.3 m5 sW new
  • Swell1.2 m8 sS
  • Swell0.5 m3 sWNW new
110° apartAbout 600 nmi to the NE (037°T)
East Lake Ontario 45012 · Great Lakes · 1 h ago
  • Wind sea1.1 m4 sNNE
East Superior 45004 · Great Lakes · 1 h ago
  • Wind sea1.6 m6 sN