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Kayakers ride tidal bore wave as it surges into Alaska's Turnagain Arm

Ron Barta / AP

A kayaker rides the biggest bore tide of the summer as it roared into Turnagain Arm south of Anchorage, Alaska, on Tuesday.

Ron Barta / AP

The biggest bore tide of the summer roared into Turnagain Arm south of Anchorage, Alaska, on Tuesday, June 5, 2012. Here a kayaker awaits the bore tide to ride it. Bore tides can happen all over the world, but Anchorage's Turnagain Arm and Knik Arms are the only places in the United States where they occur regularly, according to Michael Lawson a meteorologist with the National Weather Service in Anchorage.