<P> In meteorology, an occluded front is a weather front formed during the process of cyclogenesis when a cold front overtakes a warm front . When this occurs, the warm air is separated (occluded) from the cyclone center at the Earth's surface . The point where the warm front and the occluded front meet (and consequently the nearest location of warm air to the center of the cyclone) is called the triple point . </P> <P> The trowal (short for TROugh of Warm air ALoft) is the projection on the Earth's surface of the trough of warm air aloft formed during the occlusion process of the depression . </P>

During a cold occlusion the cold front forces the warm front to
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