Today we are going to do another improvement into the dynamic rain and thunder system we worked on. Here, we will implement a way to dynamically increase the environment fog density as the rain starts to increase the thickness of raining atmosphere. This will reduce the distance visibility as in the rain. Also, we will add a way to dynamically increase or decrease the number of rain drops in the Niagara particle . This can be used to gradually start rain as a light rain and increase to a heavy rain and also gradually make the rain go away.