Whether or not the characters are aware of them, the audience will need to see forewarnings that indicate the approach of the Consequences. Forewarnings describe the kind of items that can be used to indicate approaching Failure.
One way to bring Forewarnings into your story is to have them be glimpses of one item that gets worse and worse, such as the growing cracks in a dam above the town in which your story takes place.
Another way of bringing in Forewarnings is to use many things of a similar nature. This happens in Ghostbusters where all kinds of paranormal activity increase as Armageddon approaches. The ghosts are causing all many different types of problems, more varied than just cracks in a dam, yet they are all appropriate because they are of a like nature.
Forewarnings do not have to be based on something falling apart. Forewarnings can also be seen as something which grows, such as the slowly growing fire in Towering Inferno.
From the Dramatica Software