North Atlantic storm

25°00.5′N 060°08.8′W

Waves left about 16 Sep 02:17Z, ± 6 h

Placed by 2 buoys, whose own placements lie within 113 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