I would like to create a weather entity for  a mod i amcreateing where the entity expands untill it hits the ground or another one of the same entities. Is there a method i can add to my constructor to where that is possible?

First off, I really like the weather entity idea.

 

Second, it can be done.

 

Third, from the questions you are asking, I think you need to go look at a lot of tutorials and try some basic entities before attempting this.