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
1 h ago
Systems named
298
Swell · wind sea
205 · 93
Seas crossing
3 buoys
Storms, last month
184 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 sea1.8 ft9 sE
  • Groundswell0.8 ft14 sESE
About 2300 mi to the ENE (073°T)
Bethany Beach, DE 44084 · Eastern Seaboard North · 1 h ago
  • Groundswell1.0 ft13 sESE ↓ fading
  • Wind sea0.7 ft8 sNE new
  • Swell0.5 ft13 sNNE new
About 2200 mi to the ENE (067°T)
Block Island, RI (154) 44097 · Eastern Seaboard North · 1 h ago
  • Wind sea1.9 ft8 sSSE
  • Groundswell0.6 ft13 sSE ↓ fading
Boston, MA 44013 · Eastern Seaboard North · 1 h ago
  • Swell2.6 ft10 sE ↓ fading
About 850 mi to the ENE (071°T)
Buzzards Bay, MA (260) 44085 · Eastern Seaboard North · 2 h ago
  • Wind sea1.3 ft7 sSSW new
  • Groundswell0.6 ft13 sSSE new
Cape Cod Bay, MA (221) 44090 · Eastern Seaboard North · 2 h ago
  • Swell0.7 ft9 sN new
Cape Henry, VA 44099 · Eastern Seaboard North · 1 h ago
  • Wind sea1.6 ft8 sE ↑ building
About 2450 mi to the NE (050°T)
Georges Bank, MA 44011 · Eastern Seaboard North · 1 h ago
  • Swell4.4 ft7 sWSW
  • Swell3.1 ft9 sENE ↓ fading
180° apart
Jeffrey's Ledge, NH 44098 · Eastern Seaboard North · 1 h ago
  • Wind sea2.8 ft10 sESE ↑ building
Jonesport, ME 44027 · Eastern Seaboard North · 1 h ago
  • Swell2.1 ft8 sS ↓ fading
  • Wind sea1.0 ft3 sN new
  • Swell0.8 ft3 sENE new
  • +1 more
Long Island, NY 44025 · Eastern Seaboard North · 1 h ago
  • Swell2.2 ft8 sESE ↑ building
About 1000 mi to the E (088°T)
Nantucket Offshore, MA 44008 · Eastern Seaboard North · 1 h ago
  • Swell3.6 ft10 sENE
  • Swell1.5 ft5 sW ↓ fading
Nantucket Sound, MA 44020 · Eastern Seaboard North · 1 h ago
  • Swell0.7 ft10 sE
New York Harbor Entrance, NY 44065 · Eastern Seaboard North · 1 h ago
  • Swell1.6 ft8 sSE
  • Swell0.7 ft13 sSE new
Portland, ME 44007 · Eastern Seaboard North · 1 h ago
  • Swell1.8 ft7 sSE
  • Swell1.6 ft10 sESE ↓ fading
Thimble Shoal, VA 44087 · Eastern Seaboard North · 1 h agoCalm: no wave system large enough to name
Virginia Beach Offshore, VA 44088 · Eastern Seaboard North · 2 h ago
  • Wind sea1.9 ft10 sE
  • Groundswell0.9 ft13 sE
About 3050 mi to the E (081°T)
Virginia Beach, VA 44014 · Eastern Seaboard North · 1 h ago
  • Swell1.8 ft8 sESE ↑ building
  • Groundswell1.1 ft14 sE ↑ building
  • Swell0.6 ft5 sSE new
About 700 mi to the S (178°T)
East Lake Ontario 45012 · Great Lakes · 1 h ago
  • Swell0.6 ft2 sESE new
East Superior 45004 · Great Lakes · 1 h ago
  • Wind sea3.6 ft5 sSSW