A powerful wave sent a crowd of people scrabbling for safety in Portugal on Monday as it crashed over the sea wall in the Foz de Douro area of Porto.<br/> <br />Amateur video footage recorded the moment that the wave swept up the beach and flooded over the shore line.<br/> <br />In the video, about a dozen people who were gathered at the sea front turn and flee as the strength of the wave becomes evident.<br/> <br />Stormy weather in the Atlantic Ocean has stirred up waves of up to 60 feet (18 meters), according to surfing enthusiasts say .
