Blowing with the strength of a hurricane, the Jet Stream blasts the rocky, icy summit of Mt Everest almost all year long. The Jet Stream is a constant wind force at 4-6 miles above the earth. Observers can tell when the Jet Stream is blowing on the summit of Everest from the long white stream of ice crystals extending out from the tip of the mountain. Expeditions to the top have to choose their moment carefully. The mountain is most inviting in early May, when the Jet Stream is pushed northward over Tibet by the arrival of the monsoon. There is also a window of opportunity in fall, when the Jet Stream is pushed northward again.
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