Backward Trajectory Map in September 2010
By using computer model analyses, the past 72-hour backward trajectory of the air mass reaching Hong Kong is estimated by the Observatory on a daily basis. The daily trajectories are compiled into the Monthly Backward Trajectory Map. The Monthly Map for September 2010 is now available on the following webpage:
http://www.weather.gov.hk/wxinfo/trajectory/trajectoryMonthly_e.shtml
As revealed from the figure below, most of the air masses reaching Hong Kong in September 2010 originated from the South China Sea and the western North Pacific. Affected by northeast monsoon for the last six days of the month, the air masses reaching Hong Kong in this period followed a route from the northeast.
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