The US Weather Service controlled weather in the year 2015. The weather appeared to be planned in advance, and was controlled by the Weather Service in the Hill Valley, California area – although its range, the extent of what kind of weather it controlled, and the technology it used (which was presumably regulated by both scientists and technicians) is unknown.
The Weather Service was controlling rain on the afternoon of October 21, 2015. Doc Brown knew when the storm would end, suggesting that the service may have forecasted a weather schedule. It was extremely accurate, and Doc mentioned it was more efficient than the Post Office.