Triple-digit temperatures, more commonly seen in the middle of summer and not in the spring, made an unwelcome visit to Texas and other parts of the southeastern United States this week, placing millions of Americans under extreme heat warnings.

Texas cities that could see temperatures climb within a few degrees of highest May temperatures ever recorded include San Antonio, Dallas, Waco, Austin and others along the Interstate 35 corridor in central Texas, AccuWeather meteorologist Brandon Buckingham told Newsweek.