North Atlantic storm

26°34.3′N 043°16.9′W

Waves left about 22 Sep 14:49Z, ± 4 h

Placed by 3 buoys, whose own placements lie within 315 mi 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