North Pacific storm

05°39.1′N 163°40.4′W

Waves left about 23 Sep 20:43Z, ± 5 h

Placed by 3 buoys, whose own placements lie within 467 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