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
162 of 164
Newest spectrum
47 min ago
Systems named
318
Swell · wind sea
214 · 104
Seas crossing
6 buoys
Storms, last month
221 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 sea0.6 m9 sE
About 12350 km to the ESE (120°T)
Bethany Beach, DE 44084 · Eastern Seaboard North · 1 h ago
  • Wind sea0.5 m9 sE
Block Island, RI (154) 44097 · Eastern Seaboard North · 1 h ago
  • Wind sea0.6 m9 sE ↑ building
Boston, MA 44013 · Eastern Seaboard North · 47 min ago
  • Swell0.4 m9 sE
  • Swell0.2 m2 sSE new
About 1350 km to the ENE (071°T)
Buzzards Bay, MA (260) 44085 · Eastern Seaboard North · 1 h ago
  • Swell0.3 m11 sSSE new
  • Wind sea0.3 m3 sSW new
Cape Cod Bay, MA (221) 44090 · Eastern Seaboard North · 1 h ago
  • Wind sea0.2 m2 sE new
Cape Henry, VA 44099 · Eastern Seaboard North · 1 h ago
  • Wind sea0.5 m9 sE
  • Groundswell0.2 m13 sESE new
Georges Bank, MA 44011 · Eastern Seaboard North · 47 min ago
  • Swell0.7 m10 sESE ↓ fading
  • Swell0.3 m12 sSE new
  • Swell0.3 m4 sN new
Jeffrey's Ledge, NH 44098 · Eastern Seaboard North · 1 h ago
  • Wind sea0.6 m8 sESE ↓ fading
Jonesport, ME 44027 · Eastern Seaboard North · 47 min ago
  • Swell0.3 m8 sS ↓ fading
  • Wind sea0.2 m3 sSW new
  • Swell0.2 m12 sSSW new
Long Island, NY 44025 · Eastern Seaboard North · 57 min ago
  • Swell0.5 m9 sE new
  • Swell0.3 m4 sSSW
  • Swell0.2 m12 sSE ↓ fading
Nantucket Offshore, MA 44008 · Eastern Seaboard North · 47 min ago
  • Swell0.7 m8 sENE ↓ fading
  • Swell0.2 m4 sWSW
About 2200 km to the SSW (202°T)
Nantucket Sound, MA 44020 · Eastern Seaboard North · 47 min ago
  • Swell0.2 m6 sE new
New York Harbor Entrance, NY 44065 · Eastern Seaboard North · 47 min ago
  • Swell0.4 m10 sESE new
  • Wind sea0.3 m3 sS ↑ building
  • Swell0.2 m13 sS new
Portland, ME 44007 · Eastern Seaboard North · 47 min ago
  • Swell0.5 m8 sESE
  • Swell0.3 m3 sSSE ↑ building
  • Swell0.2 m12 sNNW new
About 1100 km to the ESE (113°T)
Thimble Shoal, VA 44087 · Eastern Seaboard North · 1 h ago
  • Wind sea0.3 m2 sSSW new
  • Swell0.2 m12 sESE new
Virginia Beach Offshore, VA 44088 · Eastern Seaboard North · 1 h ago
  • Wind sea0.5 m9 sE ↓ fading
  • Swell0.3 m12 sESE new
Virginia Beach, VA 44014 · Eastern Seaboard North · 47 min ago
  • Swell0.5 m12 sESE ↑ building
  • Swell0.3 m9 sNE ↓ fading
  • Swell0.2 m6 sSSE
About 1100 km to the S (177°T)
East Lake Ontario 45012 · Great Lakes · 47 min ago
  • Wind sea0.7 m4 sS new
  • Swell0.2 m4 sW new
East Superior 45004 · Great Lakes · 47 min ago
  • Wind sea0.4 m3 sNW ↑ building
  • Swell0.3 m4 sSSW ↓ fading