North Pacific storm

14°02.3′N 170°24.5′W

Waves left about 23 Sep 19:48Z, ± 5 h

Placed by 4 buoys, whose own placements lie within 1061 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