North Pacific storm

45°26.1′N 168°05.3′W

Waves left about 3 Sep 08:53Z, ± 3 h

Placed by 3 buoys, whose own placements lie within 290 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