Front (weather)
A weather front is a boundary separating air masses for which several characteristics differ, such as Density of air, air density, wind, temperature, and humidity. Disturbed and unstable weather due to these differences often arises along the boundary. For instance, cold fronts can bring bands of thunderstorms and Cumulonimbus cloud, cumulonimbus precipitation or be preceded by squall lines, while warm fronts are usually preceded by Stratus cloud, stratiform Precipitation (meteorology), precipitation and fog. In summer, subtler humidity gradients are known as dry lines can trigger severe weather. Some fronts produce no precipitation and little cloudiness, although there is invariably always a Wind direction, wind shift. Cold fronts generally move from west to east, whereas warm fronts move Geographical pole, poleward, although any direction is possible. Occluded fronts are a hybrid merge of the two, and stationary fronts are stalled in their motion. Cold fronts and cold occlusio ...
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