Gulf of Alaska storm

52°04.3′N 156°01.7′W

Waves left about 25 Sep 23:05Z, ± 1 h

Placed by 8 buoys, whose own placements lie within 271 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