Sections of Alaska’s capital city are bracing for the arrival of what could be record floodwaters due to rainwater and snowmelt flowing downstream from a basin dammed by the Mendenhall Glacier.

Glacial outburst floods aren't a new phenomenon in Alaska, but climate change is scrambling the geography of risk.

Record floodwaters released by the nearby Mendenhall Glacier crested Wednesday in a river that flows through Alaska’s capital city with no immediate reports of major damage, though officials warned that high water would remain for several hours.