I am an entity mage!
Had some fun here. It doesn't look too fantastic, but that's because I can't figure out how to specify my own sprite texture and get it to display right (it refuses to be translucent). Took over *math* 19+ 22+ 1+ (3*9)+ (2*9)+ (2*9)+ 5... 110 entities/outputs to accomplish. 85ish particle emitters, 9 sprites (or 1 particle, see 2nd vid), 3 relays, 2 point templates, 2 timers, 1 ambient_generic, and 10 env_soundscapes. All of that to cause it to rain. <3
Still rough around the edges, and I suspect there'll be a limit on how well I can get things timed, soundscapes seem to turn off/on at the end of their loops (with some fading) so how accurate that will be will be dependent on when the point is capped relative to the loop.
Did another go with the lightning_striker particle system. I think it looks like ass (and its behavior is unpredictable--took me four tries to actually see the lightning and I didn't change anything*)
(If the videos are low quality or not processed, give em a few minutes)
*Actually, I did. I had to change the thunder audio file because TF2 decided to bump up its volume so I had to lower it
back down again 18db (original was too quiet, so I bumped up the volume 30 db which is what you hear in the first video). But the particle system sometimes does a single strike strait down, and sometimes (less often) does a fan-web outwards on the XY plane. I've never figured out why.