Dana Parish asks: "What is a thunderhead cloud? My husband likes to point them out and we laugh at him."
Well Dana, your husband might get the last laugh because thunderhead clouds are real.
The American English dictionary defines a thunderhead cloud, or a thundercloud, as a storm cloud charged with electricity and producing lightning or thunder.
Thunderhead clouds are also known as cumulonimbus clouds, better known as a thunderstorm.
Thunderstorms form from cumulus clouds when the atmosphere is unstable enough.
You might have also heard thunderhead clouds called "anvil clouds." That's because the top of the thunderstorm actually looks like an anvil. This usually indicates a strong storm, but thunderclouds don't always have to have an anvil.