Examples of constructive interference include unpredictable rogue waves at sea and the behavior of sound in well-designed concert halls. In both situations, constructive interference occurs when multiple waves increase their amplitude by interfering with one another.
Any two waves traveling through the same medium produce interference when they meet. When the waves are in phase with one another, their amplitudes increase drastically. Architects and contractors that specialize in acoustics make use of this behavior when designing venues for music performances. Acoustically designed concert halls maximize the resonant characteristics of sound by manipulating reflections to cause constructive interference.
Rogue waves, also called freak waves or extreme storm waves, are a natural example of constructive interference. Scientists categorize a wave on the open sea as being a rogue wave when it is more than double the size of the surrounding waves in its vicinity; something that can only happen as a result of constructive interference between two or more coinciding waves. Rogue waves are highly unpredictable and often arise from unexpected directions. While rogue waves tend to appear and disappear quickly due to the transient nature of constructive interference, multiple waves traveling in the same direction can produce a rogue wave that lasts for minutes at a time.