In hot and humid tropic areas like India, thunderstorms or lightning storms are known to occur. Thunderstorms are storm accompained by heavy rains , lightning, thunder and sometimes even snow and hail. when the air near the earth's surface heats up due to the heat of the sun , it rises upward. As the warm air moves up, it cools and condenses to form clouds, which can reach heights of over 20 km. The clouds then form water droplets and ice and start falling down towards the earth collision between water droplets and ice crystals takes place due to the rising air and this causes the clouds to get electrically charged.