North Pacific storm

40°59.8′N 173°04.9′W

Waves left about 25 Oct 00:28Z, ± 4 h

Placed by 2 buoys, whose own placements lie within 88 nmi of it

Its swell is still arriving: last measured at 46259 (Santa Lucia Escarpment, CA) on 29 Oct 07:00Z.

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