North Pacific storm

48°39.6′N 138°36.1′W

Waves left about 19 Oct 00:39Z, ± 2 h

Placed by 3 buoys, whose own placements lie within 132 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