Bering Sea storm

54°50.4′N 169°50.3′E

Waves left about 23 Sep 23:37Z, ± 2 h

Placed by 6 buoys, whose own placements lie within 355 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