What constitutes a thunderstorm? What type of cloud is involved? What type of air mass would you expect in an area of thunderstorms in North America? What will be the consequence of mixing air masses...

What constitutes a thunderstorm? What type of cloud is involved? What type of air mass would you expect in an area of thunderstorms in North America?

What will be the consequence of mixing air masses with different densities? Discuss the characteristics of a microburst with some recent example.