When weather is sunny, mount Everest top often is hanging the ivory smoke cloud of banner of be similar in shape, this is cloud of Mount Everest banner. Banner cloud is by convection sex cumulus is formed, can mix according to the position of its flap height, will conclude the size of force of peak against the wind. If the position of banner cloud flap is lifted up more, explain headroom wind is smaller, be down bend more, wind-force is bigger; If mix,peak top is made the same score neat, wind-force has 9 class about. Accordingly, cloud of Mount Everest banner has again " the highest vane on the world " say.

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