North Atlantic storm

35°03.5′N 067°35.6′W

Waves left about 14 Sep 12:42Z, ± 4 h

Placed by 2 buoys, whose own placements lie within 133 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