North Atlantic storm

29°06.9′N 071°00.8′W

Waves left about 30 Sep 05:16Z, ± 3 h

Placed by 3 buoys, whose own placements lie within 100 nmi of it

Its swell was last measured at 41008 (Grays Reef, GA) on 2 Oct 09:50Z; 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