North Pacific storm

48°58.4′N 163°48.1′W

Waves left about 17 Oct 00:19Z, ± 3 h

Placed by 4 buoys, whose own placements lie within 130 nmi of it

Its swell was last measured at 46047 (Tanner Bank, CA) on 22 Oct 07:50Z; 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