When is a weather station not a weather station? (And why do they threaten to shoot me?
Some other random possibilities that come to mind are that the right-of-way to the weather station goes through the property of a cranky person (who may not have authority to keep you from using that right-of-way to visit the weather station, but they might put up a sign anyway); that people were vandalizing the weather station and the government decided to close it off; that the weather station has some peripheral involvement in the air traffic control system and thus must be protected from terror in this post-9/11 world.
