Random Riddle: 10-11-2013 - Common Sense Evaluation

I creep in with feline grace –
Stealthy, silent, gliding –
Adding beauty, mystery, and stillness to all in my path.

My shape is ever-changing:
Pausing and moving, here and there,
A cool caress across your cheek as I slip quietly by.

But my looks are deceiving –
Peril may lurk behind my misty veil.
Slow down, be cautious, or you may abruptly meet with danger there.

What am I?

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