North Pacific storm

38°48.1′N 128°39.7′W

Waves left about 15 Oct 02:30Z, ± 3 h

Placed by 3 buoys, whose own placements lie within 173 nmi of it

Its swell was last measured at 46011 (Santa Maria, CA) on 17 Oct 07:50Z; 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