South Pacific storm

07°14.7′S 174°48.5′W

Waves left about 21 Sep 11:51Z, ± 11 h

Placed by 2 buoys, whose own placements lie within 543 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