North Atlantic storm

46°42.4′N 039°50.8′W

Waves left about 12 Oct 15:05Z, ± 3 h

Placed by 6 buoys, whose own placements lie within 324 nmi of it

Its swell was last measured at 41013 (Frying Pan Shoals, NC) on 21 Oct 05:20Z; the replay ends there.

Each buoy places the storm from how its swell's period shortened as it arrived: the longest waves travel fastest. Fronts are drawn at deep-water group speeds along great circles, and stop at land. How it is worked out