Before becoming the Nationals' radio announcer, Slowes was the radio voice of the Washington Bullets from 1986 to 1997. After eleven seasons with the Bullets, he joined the expansion Tampa Bay Devil Rays in 1998 as their radio play-by-play announcer, a position he held until 2004 when he joined the Nationals the next year. Since 2006, he has teamed with Dave Jageler for Washington Nationals broadcasts.
Slowes' broadcasting style typically features home run calls of "Going, going, gone, goodbye!" and "Bang, zoom go the fireworks!" as well as the call "A Curly W [referring to the Nationals' logo] is in the books!" when the Nationals win.
A native of The Bronx, New York City, and a 1983 graduate of Fordham University, Slowes had also called play-by-play for the Baltimore Orioles and New York Mets. He began his career at KMOX Radio in St. Louis where he worked alongside broadcasting greats Jack Buck and Bob Costas. He has also worked for ESPN, NBC Sports, CBS Radio Sports, Mutual/Westwood One, SportsPhone and the minor league AAA Tidewater Tides.
- Fisher, Marc (27 March 2005). "Nats' Broadcasters Blend the Cerebral With the Visceral". Washington Post. Retrieved 8 July 2009.
- Phillips, Michael (31 May 2007). "Q&A with Charlie Slowes; Voice of Nats reflects on Opening Day '05, 'Bang Zoom' origin". nationals.com. Retrieved 8 July 2009.