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Severe Weather events
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Heavy Rain
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The frequency of occurrence of heavy rain events has increased slightly after World War II. The annual number of heavy rain days (days with hourly rainfall greater than 30 mm) increased at a rate of 0.2 days per decade from 1947 to 2012.
Number of heavy rain days (days with hourly rainfall > 30 mm) recorded at the Hong Kong Observatory Headquarters (1947-2012).
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Thunderstorms
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In Hong Kong, thunderstorms commonly occur between April and September. Thunderstorms are reported by observers at the Hong Kong Observatory Headquarters. The number of days with thunderstorms reported each year was examined. The annual number of days with thunderstorms showed an increasing trend of about 1.6 days per decade during the period 1947 to 2012, in line with the trend of heavy rain days.
Annual number of days with thunderstorms reported by observers at the Hong Kong Observatory Headquarters (1947-2012).
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Tropical Cyclones
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Modulated by El Ni?o-Southern Oscillation (ENSO) and Pacific Decadal Oscillation (PDO), there are strong inter-annual and inter-decadal variations in the tropical cyclone activity in the South China Sea. Regarding tropical cyclones affecting Hong Kong, analysis of the Hong Kong Observatory tropical cyclone records shows that there is a long-term decreasing trend in the number of tropical cyclones entering the 500 km range of Hong Kong, but the trend is not statistically significant at 5% level. Moreover, there is no significant trend in the number of tropical cyclones landing within 300 km of Hong Kong.
Annual number of tropical cyclones (including tropical depressions)
entering the 500 km range of Hong Kong from 1961 to 2012
(based on the Hong Kong Observatory tropical cyclone database).
Annual number of tropical cyclones (including tropical depressions)
landing within 300 km of Hong Kong from 1961 to 2012
(based on the Hong Kong Observatory tropical cyclone database).
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