What is the first step of each type precipitation?

The first step in each type of precipitation begins with the condensation of water vapor in the atmosphere. In the case of rain, this condensation forms droplets that grow heavy enough to fall. For snow, the water vapor directly crystallizes into ice crystals in colder temperatures. In the case of sleet or hail, the droplets can freeze or be lifted by updrafts, respectively, before falling to the ground.