In Summer, this year, Karachi witnessed an unusually strong Monsoon. Neighboring districts also saw similarly intense rainfall. Such rainfall intensity was last recorded in the city more than 40 years ago, when Karachi was much less populated. The Monsoon also arrived late, with higher volumes of rainfall in August rather than July (the historical norm). Reports from the Pakistan Meteorological Department also say that August rainfall in Sindh was 57 percent above normal.
In terms of received rainfall, in 36 hours on 11-12 August, Karachi received more than 200 millimeters (mm) of rainfall. This alone is more than the historical average rainfall for the 5 months of Summer (May to Sep). Similarly on 29-30 July, Karachi received 164 mm of rainfall.
The above normal and late patterns of rainfall have already been predicted by a report published by PMD last year. The report specifically predicts that as climate change intensifies, Monsoon rains will both increase in volume and in intensity, meaning shorter and extreme rainfall events. This coupled with poor urban management also means worse episodes of Urban (pluvial) flooding as Karachi suffered from this year.
But while southern Sindh was witnessing more rainfall, other provinces received lesser than normal rainfall, potentially affecting winter water availability and agriculture. The Pakistan Meteorological Department noted that northern regions of Azad Jammu & Kashmir and Gilgit-Baltistan both saw very unusual episodes of rainfall.