North Atlantic storm

27°32.0′N 070°56.6′W

Waves left about 21 Oct 07:09Z, ± 5 h

Placed by 2 buoys, whose own placements lie within 267 nmi of it

Its swell was last measured at 44007 (Portland, ME) on 27 Oct 00:50Z; 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