When the water drops become large enough to weigh down the updraft, they start to fall to earth, carrying the air with them. In summer, even if there are ice crystals , they melt on the way down. The water droplets rocketing toward the earth and pulling the air with it causes downdrafts . The updrafts continue supplying the warm and humid air into the thunderstorm. At this point in the storm, with both the updrafts and downdrafts occuring, this is the most destructive stage of a thunderstorm.
Downdrafts eventually grow too strong and overpower the updrafts.
Now that the major supply of warm air is cut off, the thunderstorm becomes wear and the rain begins to stop. A few other interesting points are that thunderstorms begin with an updraft of warm air, called a cell. Also, at the beginning of a storm, people usually feel a gentle wind blowing toward the storm cloud, which is the warm updraft. Since thunderstorms are very complicated and dangerous, there needs to ba a sure way to predict them. This is where you need the weather instruments to help you predict them.