South Pacific storm

34°03.5′S 143°51.2′W

Waves left about 16 Sep 10:03Z, ± 4 h

Placed by 9 buoys, whose own placements lie within 737 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