North Pacific storm

16°56.3′N 140°19.7′E

Waves left about 19 Oct 09:07Z, ± 4 h

Placed by 6 buoys, whose own placements lie within 662 nmi of it

Its swell is still arriving: last measured at 46054 (West Santa Barbara, CA) on 30 Oct 09:20Z.

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