France, July 3 -- Flooding is a recurring problem in the region, where the rainy season runs from May to July. But Ghana registered more than 140mm of rainfall within a 24-hour period, which represents one of the highest volumes recorded by the country in a single day since 1995.

"These floods will continue to become increasingly frequent and severe as global warming will intensify in the coming years," said Benjamin Sultan, a researcher at the French National Research Institute for Sustainable Development.

"It is normal for it to rain at this time of year, but not with such intensity as to cause deadly flooding."

Entire buildings and roads were submerged in Ghana's capital Accra on Monday, cutting off access to several areas of the ci...