Cyclones:
Cyclones are huge rotating winds caused by difference in the atmospheric pressure. Cyclones are formed from thunder storms and its formation depends on the speed and direction of the wind, humidity and temperature. The main source of energy are the warm moisture driven clouds that form in the oceans and seas. Cyclones can cause disasters such as floods and diseases and leave thousands of people homeless.
Tornadoes:
Tornadoes are ferocious and dangerous rotating columns of air extending from a thunderstorm to the surface of the earth.
They are usually referred as twisters or cyclones and come in many shapes and sizes with the narrow end touching the earth's surface. Tornadoes are short lived winds but can grab in anything and everything that comes in its path.