fronts collide?? What are the air masses?? A cold front occurs when a more dense air mass pushes Vietnam under a less White Flower Farm dense air mass. The following table shows the changes that occur in the weather elements. Weather fronts are zones or transitional zones that exist
between air masses of differing density. Weather fronts extend in both horizontal and vertical. AGU Press Conference: Scientists Discover Space Weather Cold Fronts. The paper below is in .pdf format and requires Adobe Acrobat Reader to view 
it.. Fronts.. The major weather story will be another developing low pressure system. This is very cold weather and residents in the region should
along the cold front. On weather maps, the surface position of the cold front is marked with the symbol
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Since lifting along fronts leads to clouds and precipitation, most severe weather will occur along a frontal boundary such as cold fronts, warm fronts,. A cold front is defined
as the transition zone where a cold air mass is 