The CW (CBS affiliate): Channel 8.1 or 1008 HD
WBAL-TV (NBC affiliate): Channel 11.1 or 1011 HD
WMAR-TV (ABC affiliate): Channel 2.1 or 1002 HD
WJLA-TV (Channel 25): Channel 254 HD
Nationwide weather channels on Comcast:
The Weather Channel: Channel 36, Ch 1036 HD
accuweather: Channel 312 HD
Weather Nation: Channel 239