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 163
Newest spectrum
36 min ago
Systems named
300
Swell · wind sea
194 · 106
Seas crossing
3 buoys
Storms, last month
180 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 sENE ↑ building
  • Groundswell0.2 m13 sESE
About 2250 nmi to the ENE (072°T)
Bethany Beach, DE 44084 · Eastern Seaboard North · 1 h ago
  • Wind sea0.4 m9 sE ↑ building
  • Groundswell0.2 m14 sENE ↓ fading
About 1950 nmi to the ENE (071°T)
Block Island, RI (154) 44097 · Eastern Seaboard North · 36 min ago
  • Wind sea0.6 m10 sS ↓ fading
  • Groundswell0.2 m13 sSE new
Boston, MA 44013 · Eastern Seaboard North · 46 min ago
  • Swell1.0 m9 sENE
About 750 nmi to the ENE (072°T)
Buzzards Bay, MA (260) 44085 · Eastern Seaboard North · 1 h ago
  • Wind sea0.5 m6 sS
Cape Cod Bay, MA (221) 44090 · Eastern Seaboard North · 1 h ago
  • Wind sea0.3 m4 sNNW
Cape Henry, VA 44099 · Eastern Seaboard North · 1 h ago
  • Wind sea0.4 m10 sE
  • Groundswell0.2 m13 sESE ↓ fading
About 2300 nmi to the NE (051°T)
Georges Bank, MA 44011 · Eastern Seaboard North · 46 min ago
  • Swell1.3 m7 sSW
  • Swell1.1 m9 sENE
155° apart
Jeffrey's Ledge, NH 44098 · Eastern Seaboard North · 1 h ago
  • Swell0.9 m10 sESE ↓ fading
Jonesport, ME 44027 · Eastern Seaboard North · 46 min ago
  • Swell0.8 m8 sSSE
  • Wind sea0.4 m3 sN new
Long Island, NY 44025 · Eastern Seaboard North · 56 min ago
  • Swell0.5 m9 sSE ↑ building
  • Swell0.2 m4 sSW new
About 1000 nmi to the E (088°T)
Nantucket Offshore, MA 44008 · Eastern Seaboard North · 1 h ago
  • Swell1.0 m10 sENE
  • Swell0.6 m6 sW ↓ fading
Nantucket Sound, MA 44020 · Eastern Seaboard North · 46 min ago
  • Swell0.2 m8 sESE new
  • Swell0.2 m4 sSE
New York Harbor Entrance, NY 44065 · Eastern Seaboard North · 46 min ago
  • Swell0.5 m8 sSE new
Portland, ME 44007 · Eastern Seaboard North · 1 h ago
  • Swell0.9 m10 sESE new
Thimble Shoal, VA 44087 · Eastern Seaboard North · 36 min agoCalm: no wave system large enough to name
Virginia Beach Offshore, VA 44088 · Eastern Seaboard North · 1 h ago
  • Wind sea0.5 m9 sE
  • Groundswell0.2 m14 sESE new
About 2650 nmi to the ENE (077°T)
Virginia Beach, VA 44014 · Eastern Seaboard North · 56 min ago
  • Swell0.4 m8 sSE
  • Swell0.3 m9 sNE
  • Groundswell0.2 m14 sE ↓ fading
About 600 nmi to the S (176°T)
East Lake Ontario 45012 · Great Lakes · 46 min ago
  • Wind sea0.2 m3 sE new
East Superior 45004 · Great Lakes · 46 min ago
  • Wind sea1.0 m5 sSSW