Update, 6:25 a.m. Wednesday: The Mendenhall River hit a record level as of 6 a.m., according to the National Weather Service. The river is in major flood stage at 16.17 feet and rising, the agency said. That surpasses the record set last year of 15.99 feet.

Residents of Alaska capital Juneau are being urged to evacuate amid an “imminent threat of catastrophic flooding from a glacier lake outburst flood.”