North Pacific storm

51°33.2′N 152°21.2′E

Waves left about 13 Oct 05:44Z, ± 3 h

Placed by 3 buoys, whose own placements lie within 368 nmi of it

Its swell was last measured at 51201 (Waimea Bay, HI) on 20 Oct 08:00Z; 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