North Pacific storm

48°43.3′N 142°38.5′W

Waves left about 20 Oct 13:24Z, ± 3 h

Placed by 2 buoys, whose own placements lie within 71 nmi of it

Its swell was last measured at 46211 (Grays Harbor, WA) on 22 Oct 01:00Z; 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