Wednesday, August 31, 2011

Warming and cooling

These huge air flow and bring us warmth of the tropics and the cold of the northern latitudes. A sudden warming occurs with the arrival of a warm air mass that moves from the southern regions to northern ones. Warm air, moving to cooler areas, is much warmer than the Earth's surface over which it passes. In this motion, the mass of air in contact with the cold earth's surface and gradually cooled. It often happens that located at the ground layer of air turns colder upper air. Warm air is rapidly cooled and water vapor that is in it, going into the clouds. Of these clouds in the lowest layers of the atmosphere drops rain and snow. These clouds are low. They often fall to the Earth's surface and pass into the solid fog. The thickness of the clouds do not usually exceed a few hundred meters. In the lower atmosphere in all seasons, especially in winter, warm air masses bring warming. For this reason, the low clouds of warm air masses usually consist of the water droplets and can not give a heavy rainfall. You can see those clouds: they are relatively low over the ground and slightly wavy solid cover is closed all the skies ahead. When they are sufficiently smooth, then they are called stratus. When the clouds are wavy, they are called - Stratocumulus. Cold air are the complete opposite of warm. They are moving from northern to southern and bring back chill. When cold air meets the warm Earth's surface, it heats up quickly from the bottom. In this case, clouds are formed. It often happens that the existing clouds and mists evaporate. This warm air rises up until then, until cooled to such an extent that its further growth becomes impossible. Then he stops and the water vapor that is in it, formed a cloud. Ta Kieu clouds are piled up in the height of the individual clubs, or "pile". They are called the cumulus or cumulonimbus. These clouds will never descend to earth and do not pass into the mists. The thickness of this cloud reaches 5 ... 8 miles. They never shut the whole sky to the horizon, and the gaps between them are pale blue. When these clouds grow to a layer of ice crystals, the tops of their fast start to blur, thus losing its own distinctive form of "cauliflower". At this time the clouds turned from cumulus to cumulonimbus. Of these clouds fall strong summer showers and heavy winter snowfalls.

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