North Pacific storm

31°56.6′N 139°47.8′E

Waves left about 30 Oct 11:56Z, ± 5 h

Placed by 3 buoys, whose own placements lie within 269 nmi of it

Its swell was last measured at 46219 (San Nicolas Island, CA) on 8 Nov 08:00Z; 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