A photo of an unusual cloud formation in the sky above the Oyu Tolgoi mine has gone viral. According to the meteorological agency, the rare phenomenon was observed in the Khanbog soum (district) of South Gobi on 27 July during a thunderstorm. There are occasional incidents of unusual clouds forming after hot days when heavy rain hits the baked earth.

On the day in question, 1.7 mm of rain had fallen in Khanbogd between 2.00 p.m. and 8.00 p.m.