Answer: The literary technique in which the chronological sequence of events is interrupted by the interjection of a future event.
Step-by-step explanation:
In a flash forward, the author would be writing about events in the chronological order in which they occurred but then this would be interjected by an event that is to happen in future.
For example, a author would be writing about kids playing in a playground and the main character looking on when all of a sudden the scene changes to the same playground in future looking desolate and nearly destroyed as a result of nuclear war then the scene reverts back to the present with children playing. The nuclear desolation was a flash forward.