The two pressure areas also produce opposite wind patterns. In the Northern Hemisphere, a low pressure area always creates a wind that blows counterclockwise around the low. The high pressure area creates a wind that blows clockwise around the high. The wind around highs and lows plays a major role in transporting warm air masses from the south and cold air masses from the north. The transportation of air masses creates what are called fronts.
Fronts are lines marking the leading edge of a change in air mass or temperature.
A leading edge of an air mass moves forward alon a weather front. When we see an approaching front, we know that the air and temperatures behind the front can bemuch different from the present air mass. Fronts help to lift and cool the air, creating clouds and precipitation. Air rotation counterclockwise around the low brings warm air from the south ahead of the low and cooler air from the north behind the center of a low. A warm front is a red line with rounded bumps on the weather map show in the leading edge of a warm air mass.