article_snippet.sent: (CNN)A mammoth wave of snow darkens the sky over Everest Base Camp.
article_snippet.sent: Appearing like a white mushroom cloud roaring over climbers stranded on Everest, climbers stranded on Everest scurry as climbers stranded on Everest tents flap like feathers in the wind.
article_snippet.sent: The harrowing two-minute clip shows the unimaginable scale of the avalanche that smashed into Everest Base Camp on Saturday.
article_snippet.sent: stranded climbers appeared to have avoided the deadly avalanche that struck Base Camp, but many -- estimated to be in the hundreds -- could not descend on stranded climbers own.
article_snippet.sent: stranded climbers can't head down because the dangerous Khumbu Icefall has been ravaged by a series of aftershocks.
article_snippet.sent: aftershocks sent snow and rocks thundering down the mountainside, complicating rescue efforts.
article_snippet.sent: Tshering Sherpa, who manages the icefall route, estimated that 100 to 200 people were stuck in the higher camps after the deadly avalanche that struck Base Camp.
article_snippet.sent: Bottom line, the dangerous Khumbu Icefall has been deemed impassable at this point," said Alan Arnette, a climber and Everest blogger who was at Camp 2 when the deadly avalanche that struck Base Camp struck.
article_snippet.sent: Alan Arnette, a climber and Everest blogger who was at Camp 2 when the avalanche struck said that climbers at Camp 2 and others higher up would descend to Camp 1 (elevation 19,500 feet) to await helicopters.
article_snippet.sent: The helicopter rescues are heavily contingent on the weather.
highlights_snippet.sent: A YouTube video shows the scale of an avalanche on Mount Everest on Saturday .
  