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
56 min ago
Systems named
320
Swell · wind sea
213 · 107
Seas crossing
6 buoys
Storms, last month
186 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 m8 sENE new
  • Groundswell0.2 m14 sSE
About 1900 km to the ENE (072°T)
Bethany Beach, DE 44084 · Eastern Seaboard North · 1 h ago
  • Wind sea0.4 m9 sE ↑ building
  • Groundswell0.2 m13 sE ↑ building
About 3500 km to the ENE (067°T)
Block Island, RI (154) 44097 · Eastern Seaboard North · 1 h ago
  • Wind sea0.6 m8 sSSE
  • Groundswell0.2 m13 sSE ↑ building
Boston, MA 44013 · Eastern Seaboard North · 1 h ago
  • Swell0.7 m9 sNE
About 1350 km to the ENE (071°T)
Buzzards Bay, MA (260) 44085 · Eastern Seaboard North · 1 h ago
  • Wind sea0.3 m9 sS new
  • Groundswell0.2 m13 sSSE new
Cape Cod Bay, MA (221) 44090 · Eastern Seaboard North · 2 h ago
  • Wind sea0.2 m8 sE new
Cape Henry, VA 44099 · Eastern Seaboard North · 1 h ago
  • Wind sea0.4 m8 sESE ↓ fading
  • Groundswell0.2 m14 sE new
Georges Bank, MA 44011 · Eastern Seaboard North · 56 min ago
  • Swell0.9 m7 sSW
  • Swell0.9 m9 sENE
  • Swell0.7 m5 sNNW new
  • +2 more
Jeffrey's Ledge, NH 44098 · Eastern Seaboard North · 1 h ago
  • Wind sea0.8 m9 sESE
Jonesport, ME 44027 · Eastern Seaboard North · 56 min ago
  • Swell0.4 m8 sS ↓ fading
  • Swell0.3 m3 sNNE new
  • Swell0.2 m4 sENE new
Long Island, NY 44025 · Eastern Seaboard North · 3 h ago
  • Swell0.6 m9 sESE
  • Swell0.2 m2 sNW new
  • Groundswell0.2 m14 sS new
About 1550 km to the E (088°T)
Nantucket Offshore, MA 44008 · Eastern Seaboard North · 56 min ago
  • Swell0.9 m8 sE ↓ fading
  • Swell0.3 m5 sSW new
  • Wind sea0.3 m4 sNNE new
  • +1 more
Nantucket Sound, MA 44020 · Eastern Seaboard North · 56 min ago
  • Swell0.2 m9 sE ↑ building
New York Harbor Entrance, NY 44065 · Eastern Seaboard North · 1 h ago
  • Swell0.5 m10 sESE ↑ building
About 1800 km to the ESE (101°T)
Portland, ME 44007 · Eastern Seaboard North · 56 min ago
  • Swell0.6 m9 sESE
  • Swell0.2 m5 sE new
Thimble Shoal, VA 44087 · Eastern Seaboard North · 1 h ago
  • Swell0.1 m12 sE new
Virginia Beach Offshore, VA 44088 · Eastern Seaboard North · 1 h ago
  • Wind sea0.6 m9 sE
  • Groundswell0.3 m14 sE new
Virginia Beach, VA 44014 · Eastern Seaboard North · 56 min ago
  • Swell0.4 m8 sSE ↓ fading
  • Groundswell0.3 m14 sE new
  • Swell0.3 m9 sNE
  • +1 more
About 1100 km to the S (177°T)
East Lake Ontario 45012 · Great Lakes · 56 min agoCalm: no wave system large enough to name
East Superior 45004 · Great Lakes · 56 min ago
  • Wind sea0.9 m5 sSSW