Like the title says. This only affects sandstorms and red sandstorms, as far as I know.
Because of that, it also makes sandstorm particles spawn in caves, which does not look too good.
I attached an image to roughly show what I'm speaking of.

Alrighty that is fixed closing the issue now :)

oh yeh i also added blizzards and heavy rain it was a very good suggestion!

oh hey thanks! I have a pretty good idea on how to fix this!