North Pacific storm

46°18.7′N 138°18.9′W

Waves left about 18 Oct 20:57Z, ± 2 h

Placed by 5 buoys, whose own placements lie within 97 nmi of it

Its swell was last measured at 46087 (Neah Bay, WA) on 21 Oct 02:20Z; 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