The Pakistan Meteorological Department (PMD) has predicted heavy rain in Karachi on Friday and Saturday.
According to PMD, fourth rain spell is expected to hit Sindh, South Punjab and eastern parts of Balochistan from Thursday (today) till Saturday.
Karachi is expected to receive heavy rainfall from Friday to Saturday with light showers till Sunday, it said.
As per the MET office, a low pressure monsoon system from Bay of Bengal is likely to reach coastal areas of Sindh tonight and widespread rain and thundershowers are expected in various areas of Sindh including Karachi, Hyderabad, Thatta, Badin, Tharparker, Umerkot, Mirpurkhas, Sanghar, Tando Allah Yar, Matiyari, Tando Muhammad Khan, Jamshoro, Dadu and Shaheed Benazirabad.
PMD has warned of urban flooding in Karachi and Hyderabad which are expected to receive torrential rainfall of up to 130 millimeters.
Prior to this Karachi received its third rain spell on 26-27 July last month. The heavy rains resulted in several areas of the metropolis being flooded by rain and sewage water due to extensive downpour and an insufficient and ineffective drainage system.