A university professor has warned people should "be careful" about wishing for heavy rain to cool down temperatures as a downpour could lead to flash floods.
Rob Thompson, who is part of the University of Reading's meteorology department, posted a video of an experiment on Twitter which used three glasses of water on different grass surfaces to demonstrate what happens when it rains after a drought.
In the first experiment, a glass of water is put on top of wet grass and rapidly soaks into the ground, with the second experiment highlighting that water soaks into grass during a normal summer at a slower pace.
