Studies of Thunderstorm and Severe Storm Frequencies

闪电探测是近年来发展起来的一项气象学新技术。到目前为止，美国东部大约有6年的闪电数据，美国中部有2年多的闪电数据，美国西部大约有4年的闪电数据。根据这份合同，昌农先生将把闪电档案和冰雹造成的农作物损失数据结合起来，这些数据由国家农作物保险局提供。探讨闪电活动与冰雹的关系。根据农作物和财产保险行业使用的标准，即100万美元或更多的损失，昌农先生还将研究美国在过去40年里的严重风暴的发生是如何变化的，在十年的尺度上，潮湿和干燥的时间延长了。

Lightning detection developed several years ago gradually emerges as a new technology in meteorology. By now, there are approximately six years of lightning data for the eastern U.S., more than two years for the central U.S., and approximately four years for the western U.S. Under this award, Mr. Changnon will combine this archive on lightning and data on crop loss due to hail, provided by the National Crop Insurance Service, to examine the relation between lightning activity and hailstorms. Guided by a normalized criterion used in the crop and property insurance industry, that is, damage of $1 million or more, Mr. Changnon will also examine how the occurrence of severe storms in the U.S. varied in the last forty years with prolonged wet and dry periods on the decadal scale.