Coverage of the effects of Hurricane Katrina will move into prime time on the Big 3 broadcast networks tonight.

CBS News’ “48 Hours” will produce a special set to air from 8-8:30 p.m. (ET) and anchored from New Orleans by John Roberts, who has been co-anchoring “CBS Evening News” from the flooded city this week.

“Dateline NBC” will present an hour-long special at 9 p.m. anchored by “NBC Nightly News” anchor Brian Williams from New Orleans.

Elizabeth Vargas, in Gulfport, Miss., will anchor an hour-long ABC News special scheduled for 10 p.m.

Also scheduled tonight are a 7-8 p.m. CNBC Business special, “Hurricane Katrina: Road to Recovery,” and a three-hour special “Evening Edition” starting at 9 p.m. on The Weather Channel.