North Atlantic storm

31°02.2′N 073°36.4′W

Waves left about 30 Sep 12:24Z, ± 4 h

Placed by 2 buoys, whose own placements lie within 25 nmi of it

Its swell was last measured at 41004 (Edisto, SC) on 2 Oct 11:50Z; 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