 And D.C., Fairfax, Loudoun, and Prince George's counties say they have cooling centers open today, while other cities and counties suggest that you head to your local public library to cool down. The public school system in Fairfax County also says it's canceled all outdoor activities today. D.C. and Arlington County have water spray parks available for use. Keep it right here on WTOP for your full weather forecast during traffic and weather on the 8s.