复杂气象是指冰、雪、霜、雷雨、大风、低云、低能见度、低空风切变等影响飞行的恶劣气象条件。通过国际民航组织对航空事故和事故征候的分析表明,恶劣的气象条件往往是航空事故发生的直接原因或间接因素。据统计,仅由恶劣天气造成的严重航空事故,占事故总数的10%-15%。在复杂天气条 Complicated weather means ice, snow, frost, thunderstorms, high winds, low clouds, low visibility, low-altitude wind shear and other adverse weather conditions that affect the flight. An analysis of aviation accidents and incidents through ICAO shows that poor weather conditions are often the direct cause of an aviation accident or an indirect factor. According to statistics, serious aviation accidents caused only by bad weather accounts for 10% -15% of the total number of accidents. In the complicated weather