North Atlantic storm

45°19.0′N 050°44.4′W

Waves left about 13 Oct 09:55Z, ± 2 h

Placed by 4 buoys, whose own placements lie within 192 nmi of it

Its swell was last measured at 41121 (Arecibo, PR) on 18 Oct 22:00Z; 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