United States Government Publishing Office
92nd Congress, 1st Session, 1971
85 STAT. 735 - AN ACT TO PROVIDE FOR THE REPORTING OF WEATHER MODIFICATION ACTIVITIES TO THE FEDERAL GOVERNMENT.
http://www.gpo.gov/fdsys/granule/STATUT ... etail.html
The date the law was approved was December 18, 1971, Steven Spielberg's birthday, which is why many of his films, including the Back to the Future trilogy, are about storms deliberately perpetrated by weather modification. Hence "Doc" Brown says he is conducting a "weather experiment" in the film.
December 18 is the date Johnstown, PA was incorporated as a city. The South Fork Dam failure, which resulted in the Great Johnstown Flood, the greatest dam failure in the history of the United States, with reportedly 2,200 killed, which is why Back to the Future is also all about their imminent plans to perpetrate dam failures.
Back to the Future is also about the presidency of "Barry" Barack Obama Sin Laden, hence Back to the Future should be understood as Barack to the Future. Back to the Future Part II is also about Joe Biden and Hillary.
It is also about their imminent plans for a cataclysmic volcanic eruption in the Pacific Northwest, connected to the blue moon.
Lord have mercy!