Pre-monsoon season is expected to lash most parts of Pakistan from June 25 to 30 as weather in Karachi changes on Friday. The city has been under the grip of heatwave-like conditions since May.

“A westerly wave is likely to enter in upper parts of the country on 25th June,” said the PMD forecast on Thursday.

According to BBC weather forecast, showers will fall on Karachi on Monday.

Indian monsoon is one the most prominent of the world’s monsoon systems, which primarily affects India and its surrounding water bodies. This process brings large amounts of rainfall to the region during June and July.

During June the easterly jet becomes firmly established at 150 to 100 millibars, an atmospheric pressure region typically occurring at elevations between 13,700 and 16,100 metres (45,000 and 53,000 feet), Brittanica said.

Amidst this, the National Disaster Management Authority warned of urban flooding in major cities and directed provinces to ensure public safety during this period.

It said the showers could cause flash flooding in Punjab and trigger landslides in the hilly areas of Khyber Pakhtunkhwa and Gilgit-Baltistan.

The areas forecast to receive rain with occasional breaks include Islamabad, Rawalpindi, Murree, Galliyat, Attock, Chakwal, Jhelum, Azad Kashmir, Gilgit-Baltistan, Chitral, Swat, Mansehra, Kohistan, Abbottabad, Haripur, Peshawar, Mardan, Swabi, Nowshera, Kurram, Bannu, Lakki Marwat, Kohat, Mianwali, Sargodha, Hafizabad, Mandi Bahauddin, Sialkot, Narowal, Lahore, Gujranwala, Gujrat, Sheikhupura, Faisalabad, Jhang and Toba Tek Singh.

Meanwhile, Sukkur, Jacobabad, and Larkana may receive rains and wind-thundershowers from June 27 to 28.

The prevailing heatwave conditions were likely to subside under the new weather system, the NDMA said in its advisory.

The NDMA stressed the need for advising farmers to take necessary mitigative measures to safeguard their crops, such as “timely harvesting, safe storage, or any other precautions from adverse effects” of dust-wind-thunderstorms and hailstorms.

“Take precautionary measures to forewarn travelers and visitors about risks posed by landslides, flash floods, and hill torrents in vulnerable locations and provide guidance and assistance in case of emergencies through local administration, police, and rescue services,” it added.