See avalanche in mid-summer

An avalanche in the summer that took place on June 25, 2011 at Mount Rainier in Washington State, USA was posted on YouTube, attracting more than 38,000 viewers for its rarity.

Mount Rainier, where an avalanche occurred.

Mount Rainier is 4,392 meters high. This is an active and unstable volcano. This mountain and the surrounding area are protected in Mount Rainier National Park.

In the description of Ouramazingplanet , the footage shows the rocks and ice covered on the pristine mountain top of Rainier tumbling down, rolling up huge pieces of debris and dust.

The article in The Seattle Times (USA) said snow and ice began to fall from the Nisqually glacier south of the mountain.

No residents were hurt by the avalanche, but a group of climbers had to flee when the dust swept into their tent.

' We have seen many avalanches like this of Mount Rainier for the past 20 years ,' said leading mountaineer expert Stefan Lofgren at Mount Rainier National Park.

In addition to the dust and snow, the footage also shows each brown mud flow (lahar) flowing downwards, indicating the danger of Rainier volcano even when they are not active.

Scientists say the cause of avalanches and mud flows often occurs at the Rainier volcano may be due to heavy snowfall and the warming climate makes the glaciers melt on this mountain slope.

Watch video of avalanche at Mount Rainier