In Meteorology, What Is a Low-Pressure Area? Additionally, cold core funnel clouds are possible if shear is significant along the cold front. On the other hand, trowal are indicated by junction of blue and red lines like the junction of cold and warm fronts aloft. Meteor. If this happens, an occluded front is born. They are indicated on a weather map either by a purple line with alternating semicircles and triangles pointing in direction of travel, or by red semicircles and blue triangles pointing in the same direction.
This can result in the piling up of three air masses on top of each other. Cold type occlusions occur where the coldest air is found behind the occlusion. Schultz, D. M., and G. Vaughan, 2011: Occluded fronts and the occlusion process: A fresh look at conventional wisdom. A cold occlusion occurs when a cold front lifts a warm front. Cold fronts generally move faster than warm fronts.

In other words, the fast-moving, incoming air is cold, but not as cold as the air mass ahead of it. A warm occlusion occurs as cool air moves rapidly into an area with an existing warm front. Amer. They are normally located within the thermal ridge on the thickness chart. The trowal on the other hand, being the projection of the warm air trough aloft, is at the same position in both cases. Occluded fronts usually form around mature low pressure areas. The main types of fronts include: If warm air moves in such a way that it advances onto and replaces the cooler air in its path, the leading edge of the warm air mass found at the earth's surface (the ground) is known as a warm front. Cold Type Occlusion. However, the clouds and precipitation are not really where the projection on the Earth's surface of the occluded front is, but with the trowal position.[3].

Bull. Prentice Hall, 1993. Djurić, D: "Weather Analysis".
ThoughtCo uses cookies to provide you with a great user experience. The primary difference between a warm and a cold type of occlusion is the location of the associated upper front in relation to the surface front (fig. By using ThoughtCo, you accept our, Occluded Fronts: When Warm and Cold Fronts Meet. In a warm type of occlusion, the upper cold front precedes the surface-occluded front by as much as 200 miles. Sometimes a cold front will "catch up" to a warm front and overtake both it and the cooler air out ahead of it.

When a cold front passes through, the weather becomes significantly colder and drier. In the case of a cold front and a warm front, there are typically two air masses that are interacting. There are two types of occlusion, warm and cold: The occluded front symbol should thus be plotted at the position where the cold air is intersecting the surface, as on the adjacent image.


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