After 20 laboratory tests and 16 field experiments, it was determined that the simulator has an average rain uniformity of 90% and rain intensity of 124 mm h-1.

UNESCO: AQUATACAMA

Anthony Pallot said the Doppler radar, near the German lookout tower at La Moye, could detect the intensity, location and how rain was moving.

BBC: Jersey weather radar upgrade 'improves forecasts'

But such was their intensity -- Wajir, northeast Kenya received more rain in six weeks (402 millimeters) than the annual average -- it led to crop damage, says the WMO.

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"Additionally, areas of heavy rain will develop across parts of northern England during Sunday afternoon and evening, although lacking the intensity of the storms further south, " the Met Office said.

BBC: Saturday's record temperatures not beaten