South Pacific storm

26°37.6′S 128°57.2′W

Waves left about 17 Sep 17:18Z, ± 8 h

Placed by 4 buoys, whose own placements lie within 517 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