An ice-dammed lake above the Valdez Glacier is undergoing an outburst event, which started on Friday. Water levels in Valdez Creek and Valdez Lake will be seeing a considerable rise.
This is a biannual event, which usually happens in mid June and then again in the fall. Water builds up in the lake above the glacier until the pressure raises the ice, and the water flows down the mountain.
The image above shows the lake caught behind the ice dam. The ice wall in the picture is approximately 200 feet high.
First image credit: City of Valdez; Second image credit: National Weather Service