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a warm occlusion, the cool air mass overtaking the warm front is warmer than the cold air ahead of the warm air mass and rides over the colder air mass while lifting the warm air, and often has the characteristics of a warm front.The occluded front symbol should show where the cold air intersects the surface. It thus varies between warm and cold occlusions. The TROWAL (short for trough of warm air aloft), is the estimated projection of the wedge of warm air above the surface, and is at the same position in both cases. Consequently, the

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