Editing Occluded front (section)

== Features and variants ==

Occluded fronts usually form around mature [[low pressure area]]s. There are two types of front occlusions, warm and cold, depending on the [[temperature]] contrast: 

* In a '''cold occlusion''', the cold air mass that overtakes the warm air mass ahead is colder than the cool air at the very front and plows under both air masses, and often has the characteristics of a cold front.
* In 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 '''TRO'''ugh of '''W'''arm air '''AL'''oft), is the estimated projection of the wedge of warm air above the surface, and is at the same position in both cases. Consequently, the location of the occluded front appearing in the  [[surface weather analysis]] is often offset from the range of the associated weather which occurs at the TROWAL. The TROWAL, is primarily found with a connection to the warm occlusion, and are rarely seen in cold occlusion. {{Clear}}