North Atlantic storm

40°27.2′N 068°34.4′W

Waves left about 17 Oct 21:26Z, ± 2 h

Placed by 7 buoys, whose own placements lie within 215 nmi of it

Its swell was last measured at 41009 (Canaveral, FL) on 23 Oct 00:50Z; 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