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1999年,上海于6月7日入梅,7月20日出梅,梅雨期持续43天。与常年比较,今年梅雨有以下特点:一是梅雨期长,较常年多出23天,且入梅提前9天,出梅滞后15天。二是梅雨量大,为常年204mm梅雨量的4倍,超过126年来历史最高纪录达244mm。三是暴雨次数多,梅雨期间共发生9场暴雨,其中2次大暴雨,破全年8次暴雨的历史纪录。四是雨量空间分布均匀,梅雨期最大点雨量与全市平均雨量的比值仅为1.17:1。在强暴雨、江浙雨洪下泄及天文大潮共同作用下,本市西部地区河网水位从6月27日起全面突破历史最高纪录,造成青浦、松江、金山、嘉定等低洼地区的洪涝害。本文就今年梅雨情况作一介绍。
In 1999, Shanghai plunged into the plum on June 7 and plum blossomed on July 20, with the plum rain lasting 43 days. Compared with the perennial year, this year’s rainy season has the following characteristics: First, the long rainy season, 23 days more than usual, and into the plum 9 days in advance, the plum lag 15 days. The second is the large amount of plum rains, which is four times of the annual plum mass of 204 mm, reaching a record high of 244 mm in more than 126 years. Thirdly, there were a lot of heavy rainstorms. There were 9 heavy rains during the rainy season, including 2 heavy storms that broke the record of 8 heavy rains throughout the year. Fourthly, the rainfall distribution is even. The ratio of the maximum rainfall during the rainy season to the average rainfall in the city is only 1.17: 1. Under the combined effects of heavy rains, rain and flood discharge in Jiangsu and Zhejiang and astronomical tide, the river network in the western part of the city comprehensively exceeded the highest record since June 27, causing floods in low-lying areas such as Qingpu, Songjiang, Jinshan and Jiading. This article on the situation of the rain this year to make an introduction.