South Pacific storm

09°51.2′S 124°56.3′W

Waves left about 1 Sep 20:57Z, ± 4 h

Placed by 3 buoys, whose own placements lie within 237 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