South Pacific storm

14°41.2′S 122°12.2′W

Waves left about 19 Sep 03:36Z, ± 6 h

Placed by 3 buoys, whose own placements lie within 458 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