In the Future the weather must be precise for Doc to know when the rain will stop. Doc also says he wishes that the post office we as efficient as the weather service but later on Western Union keeps his letter for 70 year and delivers in on time. You can also see Fusion Industries behind Marty when he exits the DeLorean. I don't know if it was fusion that made that device or if it is Fusion's headquarters. Fusion Industries is the manufacturer of the DeLoreanss Mr. Fusion Home Energy Reactor.