Backward Trajectory Map in April 2016

April 2016 was the most humid April since 1961. As shown in the air mass trajectory map, air masses reaching Hong Kong mainly originated from the south or southeast, indicating that Hong Kong was mainly affected by moist maritime airstreams during that month.

The monthly backward trajectory map of air masses reaching Hong Kong can be found at the following webpage:

http://www.weather.gov.hk/en/wxinfo/trajectory/trajectoryMonthly.shtml

Backward trajectory map of air masses reaching Hong Kong in April 2016