North Atlantic storm

39°46.4′N 056°55.9′W

Waves left about 5 Oct 00:49Z, ± 3 h

Placed by 3 buoys, whose own placements lie within 163 nmi of it

Its swell was last measured at 41044 (NE St Martin) on 9 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