Article 6- How do thunderstorms form??? Thunderstorms are formed by the uplifting of warm and humid air.When humid air is lifted, it will be cooled and the moisture in the air will condense to form cloud. Upon further uplifting, the cloud will extend higher. Water droplets in the cloud collide with each other and continue to grow in size. As the cloud extends further upward, ice crystals may form because of low temperature there. A cumulonimbus cloud results when it grows to a height of 10 to 20 kilometres. Thunderstorms are produced by cumulonimbus clouds. How are lightning produced Because it is very turbulent inside a cumulonimbus cloud, the water droplets and ice crystals in it will break up and become electrically charged. Generally speaking, the upper portion of the cloud is positively charged, while the middle and lower portions are negatively charged. When the electric voltage between the positive and negative charges is large enough, discharges take place between clouds or between cloud and the earths surface, and lightning is said to have occurred.
Posted on: Sat, 13 Sep 2014 17:09:30 +0000
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