North Pacific storm

06°38.0′N 156°46.3′W

Waves left about 26 Sep 20:56Z, ± 4 h

Placed by 3 buoys, whose own placements lie within 303 mi 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