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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:

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.

Backward Trajectory of Air Mass reaching Hong Kong in September 2010


For Daily or Seasonal Backward Trajectory Maps, please visit the following webpages:

Daily Backward Trajectory Map

Seasonal Backward Trajectory Map


Last revision date: <21 Dec 2012>