North Pacific storm

26°29.5′N 169°48.0′W

Waves left about 23 Sep 17:36Z, ± 3 h

Placed by 5 buoys, whose own placements lie within 222 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