North Atlantic storm

42°48.2′N 068°21.9′W

Waves left about 17 Oct 09:24Z, ± 5 h

Placed by 3 buoys, whose own placements lie within 73 nmi of it

Its swell was last measured at 41009 (Canaveral, FL) on 22 Oct 21:50Z; 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