North Atlantic storm

39°15.7′N 056°47.3′W

Waves left about 1 Oct 20:16Z, ± 4 h

Placed by 2 buoys, whose own placements lie within 215 nmi of it

Its swell was last measured at 41025 (Diamond Shoals, NC) on 5 Oct 10:20Z; 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