Climat :ORAGES sur le TEXAS

Publié le par RR

Thunderstorms over Texas

NASA's Tropical Rainfall Measuring Mission(TRMM) shows storms over Texas on April 30, 2004

The image shows raindrops or larger ice particles that have been carried aloft by strong rising air currents in the storms. Blue, green and red correspond to low, moderate, and high heights, respectively.

Credit  : NASA

NASA satellite finds the world's most intense thunderstorms

extrait de l'article consultable à l'adresse : http://www.eurekalert.org/pub_releases/2006-10/nsfc-nsf102406.php

"...The study also confirmed previous findings. For example, the locations of the heaviest rainfall on Earth -- usually in tropical oceans and along certain mountain slopes -- rarely coincide with the regions of most intense storms. They also found that the strongest storms tend to occur over land, rather than over oceans. The intense storms that do develop over oceans usually occur in areas near land that favor storm motion from land to ocean. Examples include tropical oceans west of Central America and West Africa, and subtropical oceans east of the southeastern United States, South America, Australia and Africa. Many regions of the world also have a seasonal preference for strong storms, including spring and summer for the south-central United States, June-August in the Sahel, and March-May over the Ganges Plain and Bangladesh.

Studying storms with satellite data began in the 1960s when researchers discovered that colder cloud top temperatures were linked to more intense storms. But later, scientists found that many storms of average intensity also reach very high altitudes, where colder temperatures are found. For a more accurate, quantitative description of a storm, radar, microwave, and lightning data are also needed to study a thunderstorm's inner structure...."

Publié dans climat

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