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Anyway, if you want rain, you can use the brush-based env_rain entity... not sure about the lightning, but the slow flicker shouldn't happen in indoor portions of your map?
Good luck! I'd love to see nice weather effects.
_you might fall from a top of a skycrapper, if you touch a func_water brush just before to touch the ground, you are totally safe, which is an incredible lack for the gameplay (on CS) and the realism ...It happens in any map, any graphics card.