North Pacific storm

34°26.8′N 167°22.0′E

Waves left about 10 Oct 20:16Z, ± 5 h

Placed by 6 buoys, whose own placements lie within 411 nmi of it

Its swell was last measured at 46211 (Grays Harbor, WA) on 21 Oct 03:00Z; 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