Which stage of storm formation is when a convection cell is created?

Condensation stage of storm formation is when a convection cell is created

Explanation:

When warm and moist air rises into the cold air that is called thunderstorm. Due to moisture that warm air becomes cooler. We all called it water vapor. It forms small water droplet and this process is understood as condensation.

The cooling of air drops which is lower in the atmosphere which becomes warm and rises again and rising and falling circuit is known as convection cell. Rising and falling is responsible of cloud formation