North Pacific storm

48°35.6′N 141°44.0′W

Waves left about 20 Oct 16:02Z, ± 3 h

Placed by 2 buoys, whose own placements lie within 52 nmi of it

Its swell was last measured at 46211 (Grays Harbor, WA) on 22 Oct 02:00Z; 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