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3. [[underlined]] CHINA TERMINALS [[/underlined]]

[[underlined]] a. [[/underlined]] The winter season at China terminals lasts from October through April. During this time there are an average of four rainy days per month. Weather is caused by frontal activity south of Kunming in conjunction with disturbances crossing the "hump" from India. There may be two or three days in succession of 500 foot ceilings and light rain. Visibility remains good dropping to no less than two or three miles during the early morning haze and fog. There have been rare instances where heavy fog has moved off the lake at Kunming to cause low visibilities for an hour or so, as was the case on the morning of November 3, 1943. Another peculiarity of the China terminals is the combination of fog and drizzle which may keep Kunming closed eight and nine hours at a time. This happened twice during November 1943, the morning of November 19 and the afternoon of November 21. To summarize, then, low ceilings and precipitation may affect China terminals for three or four days at a time. Fog alone has not been a hazard. Icing in clouds is the most important weather element. The zero degree centigrade level may be as low as 9,000 feet and there may be severe icing in cloud overcasts at altitudes of thirteen and fourteen thousand feet.

[[underlined]] VI - SUMMARY [[/underlined]]

1. Out of the four seasons over the "hump", spring and summer are the two whom instrument flying is most frequently encountered. During these seasons, the cloud formations, turbulence and winds reach their greatest intensity between noon and the latter part of the evening. After midnight there is notable clearing and the morning cloud formations can usually be flown over at seventeen and eighteen thousand feet.

2. For further information on flying during inclement weather, refer to Technical Order No. 30-100D-1; "Instrument Flying Technique in Weather", published on June 1, 1943.

By command of Brigadier General HARDIN:

J. L. TOOHEY,
Colonel, A.G.D.,
Adjutant General.

OFFICIAL:

[[signed]] J. L. TOOHEY. [[/signed]]
J. L. TOOHEY,
Colonel, A.G.D.,
Adjutant General.

DISTRIBUTION "A"

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(Page 8, ICW-ATC Cir #18, 26 March, 1944)

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