North Pacific storm

42°31.9′N 148°46.4′W

Waves left about 14 Oct 18:36Z, ± 2 h

Placed by 4 buoys, whose own placements lie within 127 nmi of it

Its swell was last measured at 46050 (Stonewall Bank, OR) on 17 Oct 11:50Z; 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