South Pacific storm

15°52.7′S 127°50.9′W

Waves left about 31 Aug 18:57Z, ± 2 h

Placed by 9 buoys, whose own placements lie within 1083 km 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