The 50 Year Storm?

Thousands of spectators and surfers are flocking to Hawaii's beaches to see the biggest waves in years crash ashore.

Heavy traffic backed up for miles Monday along roads leading to Oahu's North Shore. Some of the world's most daring surfers took on the powerful and dangerous waves, which forecasters say could reach heights of 50 feet.

The surf grew so large that a few beaches on Oahu and Maui were closed because lifeguards feared inexperienced sightseers could drown, according to state officials.

As violent as the waves were, they may grow in strength by Tuesday, according to the National Weather Service. The high waves are expected to continue through Wednesday.

A legendary big wave surfing contest, the Quiksilver in Memory of Eddie Aikau, may be held Tuesday for the first time since 2004 if waves reach a height of about 40 feet, organizers said. The event is only held in perfect conditions, and the waves weren't quite big or smooth enough yet Monday.

Hawaii hasn't seen such large waves since 2004 or 1998, he said.