Middle-latitude cyclones are fueled by

Middle-latitude cyclones are fueled by air up high in the atmosphere.

Middle-latitude cyclones are huge moving atmospheric cyclonic storms that cover a wide area (about 2000 kilometers) with low atmospheric pressure. Middle-latitude cyclones are fueled by air that can be found high up in the atmosphere. They occur due to the interaction of air masses (warm tropical and cold polar) at the polar front. A middle-latitude cyclone usually exists for about 3 to 10 days travelling in a usual west to east direction.