Chet Montgomery is a fictional character played by Damani Roberts in the television series The Office.
Season 2:
Chet currently works as the meteorologist for Channel 5. He appears on the children's television show Fundle Bundle in the same episode that Michael appeared when he was young. Michael seems to be a bit peeved that his co-workers were so excited to see Chet on the screen when he intended for it to be his moment to shine.
Trivia
The "Doppler 7" is likely a reference to the absurdly named "Live Mega Doppler 7000 HD" radar[1] used to track weather precipitation by KABC-TV (local ABC affiliate) in Los Angeles where the show is produced. Since Chet Montgomery works at Channel 5 in Scranton, their radar weather equipment would logically be called the "Doppler 5" or "Doppler 5000". WJLA-TV 7, the local ABC affiliate in Washington DC also has a "LIVE Super Doppler 7"[2].