North Pacific storm

42°41.2′N 153°22.0′E

Waves left about 22 Oct 09:27Z, ± 3 h

Placed by 5 buoys, whose own placements lie within 312 nmi of it

Its swell is still arriving: last measured at 51003 (Western Hawaii) on 29 Oct 14:20Z.

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