North Pacific storm

48°40.6′N 144°03.7′W

Waves left about 19 Oct 21:51Z, ± 2 h

Placed by 3 buoys, whose own placements lie within 127 nmi of it

Its swell was last measured at 46089 (Tillamook, OR) on 22 Oct 06:20Z; 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