An extra-tropical cyclone is a type of storm system that typically forms outside of the tropics and is characterized by its cold and warm fronts. There are several synonyms for this weather phenomena, such as mid-latitude cyclone, frontal cyclone, baroclynic cyclone, or wave cyclone. These terms are used interchangeably to describe the same weather pattern. Extra-tropical cyclones can cause severe weather conditions such as heavy rainfall, high winds, and even snowstorms. The formation of these storms is often associated with the collision of warm and cold air masses, and they tend to move towards the poles. As such, extra-tropical cyclones are an important aspect of weather forecasting and the study of climate change.