North Pacific storm

40°46.9′N 139°29.6′W

Waves left about 1 Nov 09:03Z, ± 3 h

Placed by 4 buoys, whose own placements lie within 215 nmi of it

Its swell was last measured at 46082 (Cape Suckling, AK) on 5 Nov 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