Low Pressure areas usually produce cloudy, stormy weather. When a low pressure area is over a region, the air in the atmosphere is rising. Because air rises from the surface of the earth, the pressure of the atmosphere is lower at the surface. Similar to the leading edge of army soldiers moving forward along the front line , the leading edge of an air mass moves forward along a weather front. Fronts are usually connected to a rotating low pressure system that is producing rain or snow.
Fronts also help to lift and cool the air, creating clouds and precipitation.
Air rotating counterclockwise around the low brings warm air from the south ahead of the low and cooler air from the north behind the center of the low.