North Pacific storm

49°49.7′N 140°37.7′W

Waves left about 20 Oct 06:53Z, ± 2 h

Placed by 3 buoys, whose own placements lie within 138 nmi of it

Its swell was last measured at 46027 (St Georges, CA) on 23 Oct 07:50Z; 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