(CNN) — A wave of water gushing out of an Alaskan glacial lake is causing a river to surge to a record level and is threatening significant flooding in the state capital of Juneau for the third consecutive August.

“A glacial outburst has occurred at Suicide Basin. The basin is releasing and flooding is expected along Mendenhall Lake and River,” Juneau officials said in a Tuesday news release. “Officials recommend residents in the 17ft lake level inundation zone evacuate the area until the flood waters recede.”

Suicide Basin is a glacial lake attached to the Mendenhall Glacier that runs up against the western portion of Juneau, about 10 miles from the city’s center. The basin formed as parts of its glacier melted and retreated and now acts like a giant bucket, filling up with rain, snow a

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