Put the summary of the bug you're having here

*What I expected to happen was...:*When it started raining I thought it wouldn't go through the ceiling like always 

What actually happened was...:*No matter what block made the ceiling the rain effects went right through*

Steps to Reproduce:
1.  I'm not sure because it seemed to just start out of nowhere.
2. ... I did recently transfer the world from a different hard drive
3. ...