North Pacific storm

42°59.6′N 162°12.7′E

Waves left about 23 Oct 07:23Z, ± 3 h

Placed by 2 buoys, whose own placements lie within 140 nmi of it

Its swell is still arriving: last measured at 51003 (Western Hawaii) on 30 Oct 02:20Z.

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