![]() Examples of such events took place during January and February 1996 (De Coning et al., 1998) and February 2000 (Dyson and Van Heerden, 2001). The heavy rainfall events may take place over most of the province and last for days, resulting in widespread flooding and disruption of infrastructure and even loss of life. Rainfall resulting in flooding occurs from time to time over the Gauteng Province. Keywords: widespread heavy rainfall, Gauteng, daily rainfall, weather forecasting, summer rainfall, climatology of heavy rainfall Significantly high seasonal rainfall is associated with above-normal rainfall in late summer. The 1995/96 season had above normal rainfall in both early and late summer but the 1999/2000 season was dry in early summer and very wet in late summer. With regard to seasonal rainfall, the 1995/96 summer rainfall season had the highest seasonal rainfall during this 32-yr period followed by the 1999/2000 season. The central and north-western parts of the Province experience the most events where the rainfall at a single station surpasses 75 and 115 mm. January months receive these events more than any other month but this only transpires in approximately a third of years. However, rainfall exceeding 115 mm at a single rainfall station in the Gauteng Province is very rare and does not occur every year. The highest 24-h rainfall recorded at a single station during the 32-yr period was 300 mm in December 2006. However, it is also the month with the lowest number of heavy and very heavy rainfall days. ![]() December has the second-highest monthly average rainfall and the most days with rain. The month with the second-highest number of heavy and very heavy rainfall days is February followed by March and October. January months have the highest monthly average rainfall as well as the highest number of heavy and very heavy rainfall days. ![]() A significant rainfall event is defined when the average rainfall exceeds 10 mm, a heavy rainfall event when the average rainfall exceeds 15 mm and a very heavy rainfall event when the average rainfall exceeds 25 mm. Three 24-h heavy rainfall classes are defined considering the area-average rainfall. The monthly and seasonal variation of heavy rainfall occurrences was also analysed. Heavy daily-rainfall characteristics over the Gauteng Provinceĭepartment of Geography, Geoinformatics and Meteorology, Geography Building 2-12, University of Pretoria, Pretoria 0001, South Africaĭaily rainfall over the Gauteng Province, South Africa, was analysed for the summer months of October to March using 32-yr (1977 to 2009) daily rainfall data from about 70 South African Weather Service stations. ![]()
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