North Atlantic storm

47°42.2′N 054°16.3′W

Waves left about 14 Oct 21:02Z, ± 3 h

Placed by 2 buoys, whose own placements lie within 281 nmi of it

Its swell was last measured at 41044 (NE St Martin) on 20 Oct 23:50Z; 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