North Pacific storm

41°58.0′N 149°42.7′W

Waves left about 14 Oct 15:48Z, ± 2 h

Placed by 8 buoys, whose own placements lie within 135 nmi of it

Its swell was last measured at 46080 (Portlock Bank, AK) on 18 Oct 07:20Z; 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