Please write an acrostic poem using the word Cumulonimbus. It should be all about this type of cloud and never use the word "cloud" in it.
Contained within supercell and multicell storms 
Undersides of dark, hanging walls 
Menacing creation in the sky
Upper plumes extending high
Lightning illuminating the horizon
Outward-growing at the top of the troposphere 
Nimbostratus don't get quite as stormy
Indicators of incoming rain
Multi-level bodies of water vapor
Born from convection, grown from the cumulus
Umbrellas of weather
Storing the energy of atom bombs