Reconstruction of Mesoscale Weather Patterns Embedded within the Outer Circulation of Typhoon Yancy(1990) and Analysis on the Related Aviation Accident of B-1905 Carrier

重建楊希颱風(1990)外圍環流的中尺度天氣現象與分析B-1905航機失事的可能原因

何台華(Tai-Hwa Hor) ； 徐天佑(Tian-Yow Shyu) ； 魏志憲(Chih-Hsien Wei) ； 朱炯光(Chiung-Kuang Chu) ； 陳益盛(Yi-Sheng Chen)

《觀光產業與航空管理期刊》 5卷1期 (2022/08) Pp. 60-76

https://doi.org/10.6862/JTIAM.202208_5(1).0004

摘要

The official warning of Typhoon Yancy(1990) over land was lifted by ROC Central Weather Bureau (CWB) at 0415TST(UTC+8) on 20 August 1990, and 27 hours later, the B-1905 carrier, a twin-engine Beech-1900 aircraft, prepared to descend its altitude for the landing operation. At that time, due to unknown reasons, the aircraft made a crash into a muddy sugarcane field at Dongshih, Yunlin County in central Taiwan at 0758TST(UTC+8) on 21 August 1990, killing all 18 military officers on board. The study tries to focus on the possible causes of this event through the synoptic-and meso-β scale analyses from the meteorological points of view. The preliminary results delineated that the B-1905 carrier faced severe weather situations, including the intensely vertical and horizontal wind shears, obvious updrafts/downdrafts, and the derived turbulence. Therefore, the combined impact of typhoon outer circulation and southwesterly flow, initiating a local confluent zone over the southern Taiwan Strait, was one of the probable threats for flight safety after lifting of typhoon warning. Also, a resulting schematic 3-D conceptual model for understanding the meso-β scale weather circumstances associated with the aviation threat was presented. Hopefully, the hazardous situations could be identified in advance, and might be avoided in the future.

關鍵字

typhoon outer circulation ； southwesterly flow ； wind shear ； updrafts/downdrafts

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