Bering Sea storm

52°16.0′N 167°02.3′W

Waves left about 25 Sep 03:56Z, ± 2 h

Placed by 5 buoys, whose own placements lie within 310 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