North Pacific storm

39°54.8′N 146°08.1′W

Waves left about 18 Oct 18:25Z, ± 2 h

Placed by 7 buoys, whose own placements lie within 227 nmi of it

Its swell was last measured at 46047 (Tanner Bank, CA) on 23 Oct 09:50Z; 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