Does hail + thunder and lightning = tornado?
As Zeta Reticuli says, they are not the same. However, they can sometimes be associated. This is how. Usually, warm air above the ground rises and cools down by the adiabatic effect of a lesser pressure. Then it stops rising. That is normal and the air is said to be stable. But when moist and warm air at the surface meets very cold air aloft, it keeps rising because it never gets a chance to get even with the surrounding air. What makes things worse is that, when moisture condenses, as it happens in the clouds, it releases energy in form of heat. And that makes the air inside the cloud to climb ever further. How far can the air rise? All the way to the stratosphere, where where the temperature starts to increase with altitude because of cosmic radiation. That is between 30 and 50 thousand feet, depending on the latitude. As you can imagine, such a “chimney” several miles high creates a lot of friction between the air molecules and they get statically charged. That’s why we have thunder
