North Pacific storm

39°47.1′N 163°01.0′W

Waves left about 14 Oct 04:46Z, ± 5 h

Placed by 3 buoys, whose own placements lie within 129 nmi of it

Its swell was last measured at 46082 (Cape Suckling, AK) on 19 Oct 16:20Z; 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