Snow System?

[Bya]

I'm working on a very snowy map, and I'd like to have snowflakes fall down from the sky. I have absolutely no idea how to do this. Does anyone have a Boojum-esque VMF file with one in it, or is there a tutorial on how to do this? I want one that will just have snowflakes (similar to whats in KotH_Viaduct, if there is snow falling, I have just about everything disable on my TF2 as I have a terrible computer) that fall from the sky, and cover the entire map. I'm pretty sure it's a particle system. If I don't get a snow system in my map, I'm gonna have to go back and retexture tons of brushes in my map, and I reeeeally don't wanna do that right now. Thank you in advance.

 

[Bockagon]

snow is done with particle systems, the ones from koth_viaduct can be found here. It also has the lighting and weather effects from all of the other valve maps, it's a good resource to have.

 

[Bya]

Great, thank you very much.