The National Hydrometeorology Department of the Ministry of Ecology and Natural Resources told APA that heavy rain and lightning occurred in Baku as a cold front passed on the night of September 23–24, 2013.
The hydro-meteorological stations in Baku report that 30-33 mm of rain fell within 4 hours, which makes 174-192 percent of monthly norm of precipitations.
According to the long-term meteorological data, daily rainfall for September hit record high in Baku in 1980 with 46mm rainfall within 12 hours.