A wave of water gushing out of an Alaskan glacier is threatening significant, potentially record-breaking flooding in 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 late Tuesday through Wednesday,” 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.”

Glacial lake outbursts happen when a lake of melting snow and ice and rain “drains rapidly — like pulling out the plug in a full bathtub” after pooling up so high it overtops the glacier that holds it back, according to the city of Juneau . In this case, it’s due to the Mendenhall Glacier and its c

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