curve and remain over the open water east of the China coast. However, westward intensification of the subtropical high aloft caused BILLIE to move farther west than forecast, and onto the China coast near 27 degrees north. Marked northward recurvature over the Mainland of China is believed to have been caused by a combination of the orographic effect of the mountains and east-central China and a weak trough over Manchuria. No major forecasting difficulties were encountered and the 24-hour forecast error remained well below the annual average. In general BILLIE followed July seasonal climatology quite well in movement and speed. Twenty-two warnings were issued covering a period of 6 days.
For damage caused by Typhoon BILLIE see Section VI, "Destructive Effects of Typhoons."
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