North Atlantic storm

41°20.5′N 063°20.6′W

Waves left about 24 Oct 06:49Z, ± 3 h

Placed by 2 buoys, whose own placements lie within 190 nmi of it

Its swell was last measured at 44013 (Boston, MA) on 25 Oct 12:34Z; 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