What shape are thunderstorm clouds?

Question

What shape are thunderstorm clouds?

Answer 1

Usually thunderstorm clouds(cumulonimbus) have an anvil shape at the top.

Answer 2

there are many types of storm clouds but my guess is your question is asking about what most call cumulonimbus clouds which have the tendency to billow up in an ANVIL shape

Answer 3

big dark and puffy , like they are rolling across the sky , and look really puffy looking

Answer 4

That's right. The warm moist rising updraft spreads out when it encounters the temperature inversion that is the tropopause, boundary between the troposphere and stratosphere. This creates the anvil shape but that is only visibile from a good distance. Upper level winds may spread it out enhancing that appearence.  An approaching thunderstorm often has a dark ridge of cloud with precipitation visible behind it, then a gust of wind and heavy rain follows. That dark ridge of cloud s the shelf cloud.

One of my favourite pictures:

http://www.darwinstorms.com/december/hea...