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
34 min ago
Systems named
321
Swell · wind sea
224 · 97
Seas crossing
7 buoys
Storms, last month
195 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
  • Swell0.5 m10 sE
  • Groundswell0.3 m13 sE
Bethany Beach, DE 44084 · Eastern Seaboard North · 34 min ago
  • Wind sea0.4 m10 sE
Block Island, RI (154) 44097 · Eastern Seaboard North · 1 h ago
  • Wind sea0.5 m9 sE
  • Swell0.2 m13 sNNE new
Boston, MA 44013 · Eastern Seaboard North · 1 h ago
  • Swell0.7 m9 sE ↓ fading
  • Swell0.3 m5 sENE new
About 750 nmi to the ENE (072°T)
Buzzards Bay, MA (260) 44085 · Eastern Seaboard North · 1 h ago
  • Wind sea0.4 m8 sS
Cape Cod Bay, MA (221) 44090 · Eastern Seaboard North · 1 h ago
  • Wind sea0.2 m9 sE
Cape Henry, VA 44099 · Eastern Seaboard North · 34 min ago
  • Wind sea0.4 m9 sE
  • Groundswell0.3 m13 sESE ↑ building
Georges Bank, MA 44011 · Eastern Seaboard North · 44 min ago
  • Swell1.0 m9 sE ↑ building
  • Swell0.7 m6 sWNW ↓ fading
  • Swell0.3 m6 sSSW new
Jeffrey's Ledge, NH 44098 · Eastern Seaboard North · 1 h ago
  • Wind sea0.8 m9 sE
Jonesport, ME 44027 · Eastern Seaboard North · 54 min ago
  • Swell0.5 m7 sSSE
  • Swell0.2 m13 sSW new
Long Island, NY 44025 · Eastern Seaboard North · 1 h ago
  • Swell0.6 m10 sESE
Nantucket Offshore, MA 44008 · Eastern Seaboard North · 1 h ago
  • Swell0.8 m9 sENE
  • Swell0.3 m4 sSW ↓ fading
  • Swell0.3 m7 sSSE new
Nantucket Sound, MA 44020 · Eastern Seaboard North · 44 min ago
  • Swell0.2 m8 sESE new
  • Swell0.2 m4 sESE new
New York Harbor Entrance, NY 44065 · Eastern Seaboard North · 1 h ago
  • Swell0.5 m10 sESE ↑ building
Portland, ME 44007 · Eastern Seaboard North · 54 min ago
  • Swell0.7 m7 sESE new
About 550 nmi to the ESE (111°T)
Thimble Shoal, VA 44087 · Eastern Seaboard North · 34 min ago
  • Groundswell0.2 m14 sE new
Virginia Beach Offshore, VA 44088 · Eastern Seaboard North · 1 h ago
  • Wind sea0.6 m9 sE
  • Groundswell0.3 m13 sESE
Virginia Beach, VA 44014 · Eastern Seaboard North · 1 h ago
  • Swell0.5 m9 sESE
  • Swell0.3 m13 sESE ↑ building
  • Swell0.3 m10 sNE ↑ building
About 600 nmi to the S (178°T)