North Atlantic storm

35°34.4′N 066°38.1′W

Waves left about 29 Sep 13:39Z, ± 2 h

Placed by 3 buoys, whose own placements lie within 127 nmi of it

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