North Pacific storm

39°04.9′N 152°16.0′E

Waves left about 31 Oct 12:54Z, ± 8 h

Placed by 2 buoys, whose own placements lie within 73 nmi of it

Its swell was last measured at 46072 (Central Aleutians, AK) on 4 Nov 23:50Z; the replay ends there.

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