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cold front occurs when a cold air mass moves to a surface position which was formerly occupied by a warm front.Cold fronts advance at average speeds of 35 -50 km/hr compared to an average speed of 25 -35 km/hr for warm fronts.Friction between the advancing cold front and the warm front leads to colds front being twice as steep as warm fronts.The increased speed and steepness of slope are responsible for the more violent nature of cold front weather.The intensity of precipitation is much greater at a cold front, although it is usually short in duration.The weather behind a cold front is dominated by a relatively cold air mass.Clearing usually begins at the surface position once the cold front has passed. |
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