What qualities of the West Wind are glorified in Shelley's "Ode to the West Wind"?

Shelley glorifies the West Wind as a "wild spirit" and he praises the Wind for being tameless, proud, and swift. He remembers the Wind as a pleasant force during his summer days on the shores of the Mediterranean, but also celebrates its fierce autumnal power. Most importantly, he glories in the Wind as a forceful agent of change. 

Much of the imagery of the poem revolves around the Wind's ability to scatter objects of nature. The poet wants to share the Wind's fierce spirit. As a radical, Shelley gloried in the wind's ability to blow away dead ideas, represented by the leaves that have died and fallen. But the Wind doesn't just blow away dead ideas; it also circulates fresh ideas by also blowing them all over.

Thus, Shelley celebrates the wind as prophetic: as the Wind sweeps away what is "decaying," it also sweeps in change. 

Shelly glories in the similarities between the Wind's power to blow natural elements across the earth and the poet's prophetic capabilities. If the Wind controls the leaves, the poet also writes on his own "leaves" of paper. Shelley longs for the wind's power to circulate his ideas. As he writes:

Scatter, as from an unextinguished hearth

Ashes and sparks, my words among mankind!