Thursday, August 25, 2011

Front in the atmosphere

If the warm and cold air streams do not intersect and flow in parallel, as if sliding along the front line, in the atmosphere or anything unusual is happening. At this time the front line almost immobile. But this calm does not usually last long. Warm flow begins to advance on a cold and overcome him. In this case, is called a warm front. When a warm front moving through any terrain, and there begins warming. Warm air moves quickly. He catches a cold, and press down it for themselves, and slowly covers the cold waters of its mass. You often see high in the sky, dense and smooth layer peristosloistyh and altostratus. Broad band stretching this sheet along the front lines. The width of this band reaches a few hundred meters and the length of a thousand or more miles. Warm front usually brings a long and nearly windless weather. High-transparent clouds, moving ahead of the front line, are a kind of "messengers" who warn us about the occurrence of bad weather. No less often, and other developments. It happens that on a clear day gives way to stormy rain, thunderstorm or tornado. And right there comes a sharp cold snap. Such changes occur when cold fronts. In this case, the warm air ahead of a cold rolling - he retreats. Cold air overtakes warm - he comes. If cold flow intrudes into the warm, then a shaft of swirling dark clouds. These clouds could burst downpours, thunderstorms and hail. In winter they have snow squalls and blizzards. The strongest thunderstorms and squalls are always associated with a cold front.

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