North Pacific storm

38°39.6′N 174°24.8′W

Waves left about 16 Oct 00:57Z, ± 3 h

Placed by 3 buoys, whose own placements lie within 310 nmi of it

Its swell was last measured at 46243 (Clatsop Spit, OR) on 21 Oct 10:00Z; 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