North Pacific storm

08°43.3′N 110°52.4′W

Waves left about 9 Sep 04:50Z, ± 4 h

Placed by 6 buoys, whose own placements lie within 334 nmi 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