North Pacific storm

49°24.1′N 147°05.3′W

Waves left about 19 Oct 14:01Z, ± 2 h

Placed by 4 buoys, whose own placements lie within 236 nmi of it

Its swell was last measured at 46211 (Grays Harbor, WA) on 23 Oct 03:00Z; 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