Thunderstorms are the storms with thunder and lightning. Thunderstorms are due to the uneven heating of air around the earth. The earth's surface is heated by the surface of the sun. Air above the earth's surface is heated by conduction. As the temperature increases, strong and upward rising winds are produced. This upward rising of winds results in condensation along with release of massive amounts of heat. This rapid movement of condensed moisture along with the rising air creates lightning and thunder.