North Pacific storm

38°25.1′N 173°23.9′E

Waves left about 21 Oct 01:45Z, ± 5 h

Placed by 2 buoys, whose own placements lie within 431 nmi of it

Its swell was last measured at 46011 (Santa Maria, CA) on 27 Oct 18:50Z; 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