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A cold front is a boundary between a cold air mass and warmer air masses, often causing meteorological activity. It is represented by a blue line on weather maps and can result in severe storms. As it travels, it warms and changes weather patterns. Meteorologists use temperature sampling to identify it.
A cold front is a boundary at the edge of a cold air mass. Meteorological activity often takes place at this boundary due to interactions between the cold front and warmer air masses. On a weather map, this phenomenon is represented by a blue line illustrating its boundary and by a series of triangles indicating the direction of movement. The movement of fronts is often very predictable because they tend to follow established weather patterns.
Several features can be seen within a cold air mass. The air is denser and therefore the mass tends to adhere to the ground. This pushes the warm air up. At the cold front, air pressure is higher and will remain high as the cold mass moves over the ground and temperatures are cooler. It’s important to be aware that these air masses aren’t necessarily cold in the sense that people will want to whip out a jacket as they pass; they are simply colder than other air masses in the region. They can even be dry, with no rain, if humidity levels are low.
The cold front serves as the leading edge of a wedge. Where it interacts with warmer air, it’s common to see wind gusts and precipitation caused by water vapor in the air responding to the change in temperature. Sometimes very severe storm systems can form, resulting in hurricanes and tornadoes. This is more common when multiple fronts collide and start mixing.
As a cold front travels, it will begin to warm. The sun will heat the earth’s surface and this acts to radiate heat through the air, forcing it to warm up and begin to rise. This will lead to changes in weather patterns. People in the northern hemisphere may notice that bad weather tends to move north, the result of cold fronts moving into areas of warmer air to displace them as more cold air is generated far north. In the southern hemisphere the opposite is the case.
Meteorologists can identify a cold front with temperature sampling. If they notice a noticeable temperature differential between two places, there is clearly a boundary between two air masses between them. You can follow the front while making predictions about how it will move so that the public can plan its activities accordingly. People may need to do things like cover plants to protect them from frost or close the shutters on the windows before a storm with high winds.
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