North Pacific storm

42°10.7′N 174°39.7′W

Waves left about 16 Oct 03:48Z, ± 4 h

Placed by 2 buoys, whose own placements lie within 165 nmi of it

Its swell was last measured at 46278 (Tillamook Bay South Jetty, OR) on 21 Oct 05:00Z; 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