North Pacific storm

32°19.9′N 152°18.9′W

Waves left about 19 Sep 14:44Z, ± 5 h

Placed by 3 buoys, whose own placements lie within 268 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