A rush of glacial floodwater swept down Alaska’s Mendenhall River on Wednesday morning, prompting evacuation warnings in parts of Juneau.

City officials say the flood threat has ended and credit barriers with preventing more damage from the Mendenhall Glacier outburst

It’s a complex topic, but we’re going to make sense of it. Juneau is under threat of flooding due to what’s known as a “glacial outburst,” and it’s happening more frequently due to rising rainfall and snowmelt.