Gulf of Alaska storm

50°38.7′N 142°33.6′W

Waves left about 26 Sep 23:46Z, ± 1 h

Placed by 10 buoys, whose own placements lie within 289 mi 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