North Pacific storm

47°43.6′N 146°39.4′W

Waves left about 19 Oct 15:46Z, ± 3 h

Placed by 2 buoys, whose own placements lie within 39 nmi of it

Its swell was last measured at 46029 (Columbia River Bar, OR) on 22 Oct 03:20Z; 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