What happens along cold fronts and warm fronts?
The boundary between two air masses is called a front. As a result, moving fronts indicate a change in the weather. On a weather map fronts are drawn where there is large change in temperature and a shift in wind direction. A front can also be described as the boundary between adjacent Highs with different conditions. On a weather map, fair weather is generally associated with Highs while stormy weather is associated with Lows and with the portions of fronts that extend from them. Highs and Lows are usually hundreds or thousands of miles across. Both Highs and Lows tend to travel from west to east across the United States, bringing changing weather as they move. The image above shows an example of a weather map containing a warm and cold front. A cold front means a cold air mass is pushing into a warmer air mass, and is shown with blue sharp “teeth” pointing the direction of the moving cold air. A warm front means a warm air mass is pushing into a colder air mass, and is shown with red
