Tornadoes
Most tornadoes form from thunderstorms. You need warm, moist air from the Gulf of Mexico and cool, dry air from Canada. When these two air masses meet, they create instability in the atmosphere.
10 Different Weather Types
This picture shows the formation of a tornado
Hurricanes
They form near the equator over warm ocean waters. In general , the term hurricane is used only for the large storms that form over the Atlantic Ocean or eastern Pacific Ocean.
This picture show the beginning stages of a hurricane
Twister
Thunderstorms