North Atlantic storm

33°25.0′N 062°43.1′W

Waves left about 12 Sep 15:28Z, ± 4 h

Placed by 3 buoys, whose own placements lie within 152 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