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一、引言 1999年6月6日,云南航空公司的一架曼谷-昆明的国际航班,在景洪(21.9N、101.1E)到昆明(25.1N、102.7E)的航路上,于1330时(UTE)开始同地面指挥失去联系将近2小时,最后备降成都成功,才与昆明地面指挥取得联系,这是一起严重的飞行事故征候。事后机组回忆,飞行中遇到大范围的CB云系,抬升飞行高度到万米高空,仍绕飞困难,同时与地面又失去联系,被迫从西北方向绕飞,经中甸、西昌,最终备降成都,飞机落地后,燃油将尽。当日的大尺度天气系统背景:在外蒙古形成的冷锋于6日12时移至南昌-桂林-昆明一线,500hPa槽前的西南暖湿气流和沿副热带高压外围的东南暖湿气流在本区域内汇合,云南省内产生了大范围的降水,一些地方产生了大暴雨天气。
I. INTRODUCTION On June 6, 1999, an international flight of Yunnan Airlines from Bangkok-Kunming on the route from Jinghong (21.9N, 101.1E) to Kunming (25.1N, 102.7E) at 1330 hrs UTE) began to lose contact with the ground command for nearly 2 hours, and finally prepared to succeed in Chengdu, before getting in touch with the ground command in Kunming, which is a serious flight accident. Afterwards, the crew recalled that they encountered a large range of CB clouds in flight and lifted the flight altitude to a height of 10,000 meters. They still struggled to fly around and at the same time lost contact with the ground. They were forced to fly around from the northwest to the north via Xidian and Xichang Ready to drop Chengdu, the aircraft landed, the fuel will do. Large-scale weather system on that day Background: The cold front formed in Outer Mongolia moved to Nanchang-Guilin-Kunming first line at 12 o’clock on the the 6th. The warm and humid southwest flow in front of the 500hPa tank and the southeast warm and humid flow in the periphery along the subtropical high converge in this area There was a wide range of precipitation in Yunnan Province and heavy rainstorms in some places.