there are spread
On the blue surface of thine aery surge,
Like the bright hair uplifted from the head
Of some fierce Maenad, even from the dim verge Of the horizon to the zenith’s height,
The locks of the approaching storm.

Ans  The quoted lines occur in the celebrated poem “Ode to the West Wind” by the great Romantic poet P. B. Shelley. The poet here describes the effect of the wind on the sky. The quoted lines give a graphic description of how the West Wind brings about violent storm in the sky.

The wind breaks the clouds up “like earth’s decaying leaves” that are shaken “from the tangled boughs of Heaven and Ocean”. The forceful wind breaks apart the clouds and scatters them just like leaves from trees. Shelley compares rain and lightning to angels, and says the wind spreads them both through the sky “like the bright hair uplifted from the head”. So, the rain and lighting are spread across the sky like someone’s hair that is lifted up and splayed in the wind. He then compares the wind to a crazy, intense, wild-woman (Maenad) to indicate a coming storm. The wind spreads the clouds in a way that the entire sky from the dim horizon up to the highest zenith becomes overcast with them.