South Pacific storm

31°09.3′S 142°45.8′W

Waves left about 10 Sep 06:54Z, ± 4 h

Placed by 10 buoys, whose own placements lie within 1208 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