Hey guys, posting a thread with the attachment tutorial I promised! Here are the videos for the lightning effects in my mod if you haven't seen them yet.
v1.1
v1.2
I highly suggest that you read the README file. You NEED to read the warning file, but in case you don't, you're gonna read this instead!
Do NOT open the .map file if you are sensitive to flashing lights. The map file has flickering lights and billboards. On that same token, try to avoid working on lightning effects for more than 20-30 minutes, as it can give you headaches (gave me some a few times, and some dizziness)
EDIT: Forgot to mention the ThunderSFX function in the README! Change that function to play the sound at any place you want. You can create multiple areas named "thunder_area_1", "thunder_area_2", etc, and have the function do PlaySoundAtEntity("", "general_thunder.snt", "thunder_area_"+RandInt(1,6), 0, false);. Change 6 to the total number of thunder areas you have.
Now that all is said and done, the attachment can be downloaded below! Enjoy!