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How Does a Thunderstorm Form
A thunderstorm is formed by means of a humid airmass which means that air that is formed with an abundance of water vapor. There is also currents of air called updrafts. The air mass rises through the atmosphere and eventually cools where water vapor condenses to form droplets of liquid water releasing heat in the process. A cloud then forms and the liquid drops from the cloud making rain.
A supercell is basically massive amounts of rotation caused by updrafts. things that are contained in a supercell are tornaoes, hail, heavy rain, straight line winds and lots of energy that produces lightning and thunder. supercells are extremely unstable due to high levels of moisture and heat. The anatomy of a supercell is more complex then you think. a cap or capping inversion puts a warm above cold layer above a normal cold above warm boundary layer. Air below the cap becomes more moist and heats up which causes high levels of moisture.

Features of a supercell
An Overshooting Top is the result of powerful updraft and is above the anvil. the overshooting top can not be seen from the ground.

The Anvil is precip free and often cold, there is very little moisture in the anvil. clouds take their anvil shape when the air that rises reaches 40,000 or more feet.

The Wall Cloud forms near the downdraft/updraft interface. the interface is the area between the precip area and precipitation free base. wall clouds form when cooled air from the downdraft is pulled into the updraft. Wall clouds are very common amoung supercells but little only produce tornadoes. Wall clouds that are present for 10 minutes or more, move violently up or down mean that a tornado is very likely.

Precipitation free base is obviously by the name is precip free and is located at the bottom of the main updraft and is the main area of inflow. observer may not be able to see precipitation falling but large hail and and rain may be falling from this area.

Precipitation area is the area with the most precipitation or the heaviest rain.