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Warm Front
A warm front is a mass of warm air that converges on a mass of colder air. It is essentially the meeting point of cold and warm air. When a warm front moves in, it typically brings warmer temperatures and more moisture in the air. Warm fronts move from southwest to northeast in the northern hemisphere.
Frontogenesis
Frontogenesis is the creation of a front, either warm or cold. Any time a mass of air converges with another that is warmer or cooler, a front is formed. A warm front will gradually slope up and over the cooler front. Because of this soft slope, weather tends to be less violent than when cold air moves in on warm air. Cold air converging on a warm front can cause severe thunderstorms. Though rain can be caused when a warm front moves in, skies are typically clear afterward.
Warming of a Front
Air becomes warm when it passes over locations where climates are typically warmer than anywhere else in the northern hemisphere. As the air passes from the south to the north, it is warmed. It can be heated over tropical waters or hot land masses. However, in the southern hemisphere, warmed air comes from the north, while cold weather fronts come from the south.
Characteristics
There are many other characteristics of a warm front than just warmer temperatures. These air masses move much more slowly than cold fronts, and bring fog. There may be light rain in the beginning, but then there is none once the front pushes the cold front out. Warm fronts also span a large part of the region. They tend to stretch across much of the country, while a cold front typically spans just a state or two.