North Atlantic storm

17°55.0′N 020°20.0′W

Waves left about 19 Oct 10:16Z, ± 6 h

Placed by 2 buoys, whose own placements lie within 362 nmi of it

Its swell was last measured at 44091 (Barnegat, NJ (209)) on 30 Oct 06:00Z; 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