“Does that mean 180 foot tall wave?”
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No...It means a 180 foot Transient...90 feet up plus 90 feet down would be a 180 foot Transient (think roller coaster)
Faulty sensor or “local” event. It could be anything from an explosion to a 10 lb meteorite or maybe a submarine (submerged) snagged its mooring cable.
Like I said “unexplained”...
(Where’s that guy with the weird hair...”It was Aliens”)
Just so long as I am not on that wave I’ll be okay.... eeek