North Pacific storm

44°56.1′N 166°41.6′W

Waves left about 25 Sep 10:16Z, ± 2 h

Placed by 7 buoys, whose own placements lie within 372 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