North Pacific storm

41°00.6′N 153°29.0′E

Waves left about 7 Nov 17:39Z, ± 4 h

Placed by 2 buoys, whose own placements lie within 140 nmi of it

Its swell is still arriving: last measured at 52213 (North Point, Pohnpei) on 13 Nov 09:00Z.

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