North Pacific storm

37°53.8′N 148°33.4′W

Waves left about 13 Oct 07:10Z, ± 2 h

Placed by 7 buoys, whose own placements lie within 246 nmi of it

Its swell was last measured at 46080 (Portlock Bank, AK) on 18 Oct 17:50Z; the replay ends there.

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