Furnace to flood: world's hottest city under water

STORY: This was named the world's hottest city three months ago. Now Jacobabad is under water.

Residents displaced by the floods in the southern Pakistani city are grappling with devastating loss.

At least 19 people have died.

More than 40,000 of Jacobabad's 200,000 people are living in temporary shelters, mostly unsanitary crowded schools like this one, with little food.

Muhammad Nawaz and his family lost their home.

"When the floods came, our houses were destroyed. It was neck-deep water. I only just managed to save my family and reached here. We have been sitting at the camp for a week, getting only some rice. Our children are small and they need milk, but we are giving them water in their bottles mixed with sugar, since there is no milk.”

On May 14, temperatures in Jacobabad hit 124 degrees fahrenheit, making it the world's hottest city at that time.

The prolonged heatwave dried up canal beds and some residents collapsed from heatstroke.

It's in Sindh province, one of the areas worst hit by the torrential rains and flooding that have submerged a third of Pakistan and killed more than 1,100 people.

Such extreme weather events in a short space of time have wreaked havoc across the country, cutting off communities, wrecking homes and infrastructure, and raising concerns over health and food security.

Doctor Vijay Kumar says the unsanitary conditions are causing soaring rates of illness in Jacobabad.

“Before the floods we used to see 50 to 60 patients during my night duty, but now we're seeing 130 to 140 patients coming in to the hospital each night. My night duty is from 9 p.m to 9 a.m.”

Pakistan's meteorological office has predicted more rains and flash flooding for the month of September.