The third-round group stage match between Real Madrid and Salzburg will be held in Philadelphia and will begin at 4:00 a.m. in Moscow.
According to the source, due to unseasonable heat in the state, a thunderstorm is expected to be a risk for the game.
According to the rules for matches in the United States, if a thunderstorm occurs within an 8-mile radius (approximately 13 kilometers) of the stadium, play will be suspended: the teams will leave the field, and the crowd will be in the stands. The match will only resume if there are no repeated thunderstorms and thunderstorms for at least 30 minutes. Source link