The reason is strong heat in the urban area. According to weather forecasters, in the daytime air in Moscow and the area in the first half of the week will warm +31.

Earlier, the leading expert of Fobos Mikhail Leus said that thunder rains could be closer to the weekends in the city. They will drive the temperature up to 24-26 degrees.
Sinoptic Leus: Thunderstorms can occur in Moscow on weekends