North Pacific storm

47°58.7′N 171°10.9′W

Waves left about 23 Oct 21:28Z, ± 4 h

Placed by 5 buoys, whose own placements lie within 260 nmi of it

Its swell was last measured at 51201 (Waimea Bay, HI) on 29 Oct 15:00Z; 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