I think there's misreportage in play here, after many pints down the pub last night, I was told the waves wouldn't be 2-3 meters but more than 500 meters and hundreds of them too. He said that's good thing becuase last time they were over 10,00 meters high or so it looked from his apartment, just 30kms from the river in the one small and broken window he has. It could be true.