Schools and many offices were closed across the United Arab Emirates on Thursday as heavy rains returned to the desert country just two weeks after record downpours that experts linked to climate change. A lightning storm with high winds swept across the oil-rich monarchy overnight, with more than 50 millimetres (two inches) of rain falling before 8am (4am GMT) in some areas, the National Center of Meteorology said. Flooding was seen in some parts of financial hub Dubai, and the city’s airport, the world’s busiest by international passenger traffic, cancelled 13 flights and diverted five, a sp…