Backward Trajectory Map in January 2013
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In January 2013, the air masses reaching Hong Kong mainly originated from the north and northeast, indicating that the territory was under the influence of the relatively dry winter monsoon most of the time.
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Backward Trajectory of Air Mass reaching Hong Kong in January 2013
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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 January 2013 is now available on the following webpage:
For Daily or Seasonal Backward Trajectory Maps, please visit the following webpages: Daily Backward Trajectory Map
Seasonal Backward Trajectory Map
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