Refineries are often associated with smoke stacks, steam plumes, and industrial activity, but few people realize they can also play a role in shaping the clouds above us. In certain conditions, refinery emissions may not only create visible plumes but also seed or enhance clouds that can produce rain. This phenomenon is especially notable in coastal areas like Southern California, where the Torrance and El Segundo refineries sit just miles from the Pacific Ocean. With high humidity from the marine layer, frequent temperature inversions, and strong sea breezes, these facilities are uniquely positioned to influence local weather. Understanding how refineries can create clouds and even rainfall is crucial for communities, regulators, and anyone concerned about air quality and environmental health.