Southern Ocean storm

47°02.8′S 172°04.9′W

Waves left about 23 Sep 04:31Z, ± 12 h

Placed by 2 buoys, whose own placements lie within 1057 km of it

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