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 162
Newest spectrum
44 min ago
Systems named
311
Swell · wind sea
202 · 109
Seas crossing
13 buoys
Storms, last month
164 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 sea2.4 ft9 sE
Bethany Beach, DE 44084 · Eastern Seaboard North · 44 min ago
  • Wind sea1.4 ft10 sENE ↓ fading
  • Swell0.6 ft10 sESE new
Block Island, RI (154) 44097 · Eastern Seaboard North · 44 min ago
  • Wind sea3.9 ft7 sE new
Boston, MA 44013 · Eastern Seaboard North · 1 h ago
  • Swell4.7 ft9 sENE
  • Wind sea1.6 ft3 sN new
Buzzards Bay, MA (260) 44085 · Eastern Seaboard North · 1 h ago
  • Wind sea3.3 ft7 sSSW ↓ fading
About 2350 mi to the SE (145°T)
Cape Cod Bay, MA (221) 44090 · Eastern Seaboard North · 1 h ago
  • Wind sea2.4 ft3 sNNW new
Cape Henry, VA 44099 · Eastern Seaboard North · 44 min ago
  • Wind sea1.4 ft10 sE
Georges Bank, MA 44011 · Eastern Seaboard North · 1 h ago
  • Swell5.6 ft9 sENE ↑ building
  • Wind sea5.4 ft8 sSSW
140° apart
Jeffrey's Ledge, NH 44098 · Eastern Seaboard North · 1 h ago
  • Wind sea5.3 ft9 sE ↓ fading
Jonesport, ME 44027 · Eastern Seaboard North · 1 h ago
  • Swell3.2 ft8 sSSE ↑ building
  • Wind sea2.2 ft5 sNNE new
  • Swell1.1 ft4 sESE new
Long Island, NY 44025 · Eastern Seaboard North · 1 h ago
  • Swell2.5 ft9 sNE new
  • Swell1.0 ft3 sSW new
Nantucket Offshore, MA 44008 · Eastern Seaboard North · 1 h ago
  • Swell5.8 ft8 sSW ↓ fading
  • Swell4.2 ft8 sENE
150° apart
Nantucket Sound, MA 44020 · Eastern Seaboard North · 1 h ago
  • Swell1.2 ft8 sESE new
  • Wind sea1.2 ft3 sWSW new
New York Harbor Entrance, NY 44065 · Eastern Seaboard North · 1 h ago
  • Swell1.8 ft9 sESE ↓ fading
  • Swell0.7 ft6 sE new
Portland, ME 44007 · Eastern Seaboard North · 1 h ago
  • Swell3.5 ft7 sESE new
  • Swell2.5 ft5 sE new
About 3450 mi to the ESE (118°T)
Thimble Shoal, VA 44087 · Eastern Seaboard North · 44 min agoCalm: no wave system large enough to name
Virginia Beach Offshore, VA 44088 · Eastern Seaboard North · 1 h ago
  • Wind sea2.1 ft8 sESE ↑ building
Virginia Beach, VA 44014 · Eastern Seaboard North · 1 h ago
  • Swell1.6 ft9 sESE
  • Swell1.0 ft5 sNNE ↑ building
  • Swell0.7 ft5 sS ↓ fading
  • +2 more
About 750 mi to the S (177°T)
East Lake Ontario 45012 · Great Lakes · 54 min ago
  • Swell0.9 ft4 sENE new
Grand Island North, MI 45211 · Great Lakes · 44 min agoCalm: no wave system large enough to name