I am white, grey, blue as well
sometimes I'm wispy and others I swell
with drops of vapor from the air
When driving through me give great care.
Many shapes in me you'll see up high,
but down below they're more difficult to spy
I can ruin a day or a ball game
bring tornadoes and rain.
I swiftly cover up the light
and rumbles within can cause great fright.
What am I?
