North Pacific storm

38°20.8′N 159°29.2′W

Waves left about 7 Oct 01:14Z, ± 10 h

Placed by 2 buoys, whose own placements lie within 110 nmi of it

Its swell was last measured at 46085 (Central Gulf of Alaska) on 12 Oct 12:50Z; 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