This warmed air rises by convection and forms Cumulus. A wall cloud that may produce a tornado can exist for 10–20 minutes before a tornado appears but not always. The wall cloud is usually to the rear of the visible precipitation area. Providing that more air feeds in from below new cloud will form there and preserve the flat bottom.Ī wall cloud is an isolated cloud lowering attached to the rain-free base of the thunderstorm.

The altitude where that happens marks the bottom of the cloud. Why do storm clouds have flat tops? – Naked Science ScrapbookĪs warm air rises the water vapour remains invisible until the air cools enough for it to condense into water droplets.Ask Ellen: Why do some clouds have flat bottoms and puffy tops?.Does a tornado have to have a wall cloud?.What does it mean to see a skull in the clouds?.Which is the wettest place on the earth?.What is the highest cloud ever recorded?.What does it mean if you see a baby in the clouds?.What clouds are fluffy and flat on the bottom?.What is it called when clouds are flat on the bottom?.

A puffy white cloud with a flat bottom