Fast National ratings for Thursday, Sept. 3, 2009.

Viewers tuned in to CBS to watch "Big Brother" split up Jeff-and-Jordan and stuck around for the rest of the evening, as the network dominated Thursday in all key measures.

Among adults 18-49, CBS averaged a 2.5 rating, well ahead of the 1.7 rating for FOX and NBC's 1.6 rating. ABC was fourth in the key demographic with a 1.3 rating, followed by the 0.6 rating for The CW.

Overall, CBS averaged an estimated 9.375 million viewers to go with a 6.0 rating/10 share. None of the other networks were close, with FOX's 3.4/6, NBC's 3.3/6 and ABC's 3.1/5 following in a clump. The CW was fifth with a 1.1/2.

In the 8 p.m. hour, CBS got a strong 5.4/10 from "Big Brother," which also delivered a 2.7 rating in the 18-49 demographic, the night's highest. FOX's "Bones" had a 3.8/7 for second, while ABC's "Grey's Anatomy" and NBC's "30 Rock" and "Parks and Recreation" tied for third (advantage NBC in both viewers and 18-49). The CW's "Supernatural" was fifth with a 1.2/2.

"CSI: Crime Scene Investigation" was up to a 6.1/10 for CBS in the 9 p.m. hour (but lost 18-49 viewership from its lead-in). ABC's "Grey's Anatomy" was second, beating the 3.1/5 for NBC's "The Office" and "30 Rock." FOX's Twitter-enhanced "Fringe" had a 3.0/5, dropping in both viewers and 18-49 rating from its "Bones" lead-in. The CW's "Supernatural" had a 1.1/2.

"The Mentalist" closed the night with a 6.5/11 for CBS. NBC's "Law & Order" had a 3.5/6 for a distant second. ABC's "Private Practice" trailed.

 

All ratings information comes from preliminary Fast National Nielsen data, which includes live and same-day DVR viewing. All numbers are subject to change.

 

Dan-feinberg-med
A long-time member of the TCA Board and a longer-time blogger of "American Idol," Dan Fienberg writes about TV, except for when he writes about movies or sometimes writes about the Red Sox. But never music. He would sound stupid talking about music.