Southern Ocean storm

56°29.0′S 122°16.7′W

Waves left about 8 Oct 15:40Z, ± 11 h

Placed by 5 buoys, whose own placements lie within 939 nmi of it

Its swell was last measured at 46218 (Harvest, CA (071)) on 21 Oct 15:00Z; 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