North Atlantic storm

37°51.4′N 053°41.1′W

Waves left about 8 Nov 00:43Z, ± 3 h

Placed by 3 buoys, whose own placements lie within 183 nmi of it

Its swell was last measured at 41121 (Arecibo, PR) on 12 Nov 10:53Z; 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