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What happens at the boundaries between warm and cold masses of air? When warmer air replaces cooler air, it is called a warm front. Similarly, a cold front describes the situation when a mass of cooler air replaces warm air. These fronts are shown on weather charts as lines with either red semi-circles (indicating a warm front) or blue triangles (showing a cold front). These symbols are placed on one side of the frontal line to show which way the front is moving.
As cold fronts move more quickly than warm fronts, they can catch up with the warm front ahead. This is called an occlusion.
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Major funding for Rough Science was provided by the National Science Foundation. Corporate funding was provided by Subaru. Copyright © 2002 The Open University and WETA. |
