North Pacific storm

48°00.4′N 141°09.8′W

Waves left about 20 Oct 04:47Z, ± 2 h

Placed by 4 buoys, whose own placements lie within 136 nmi of it

Its swell was last measured at 46243 (Clatsop Spit, OR) on 22 Oct 07:00Z; 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