Gulf of Alaska storm

50°20.9′N 154°43.1′W

Waves left about 26 Sep 02:24Z, ± 2 h

Placed by 7 buoys, whose own placements lie within 287 nmi 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