North Pacific storm

27°16.4′N 135°03.4′W

Waves left about 11 Oct 09:48Z, ± 3 h

Placed by 2 buoys, whose own placements lie within 81 nmi of it

Its swell was last measured at 46001 (W Gulf of Alaska) on 16 Oct 21:20Z; 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