Gulf of Alaska storm

51°34.9′N 158°48.0′W

Waves left about 26 Oct 16:04Z, ± 3 h

Placed by 2 buoys, whose own placements lie within 127 nmi of it

Its swell is still arriving: last measured at 46077 (Shelikof Strait, AK) on 29 Oct 02:20Z.

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