This post has been revised to include updated graphics, warnings and safety tips.
The National Weather Service's New Orleans office has upgraded its freeze watches to warnings, which indicate an imminent onset of precarious conditions, and is warning residents of Southeast Louisiana to prepare for the "invasion" of an arctic airmass this evening.
The temperature will plummet from highs in the 60s on Tuesday to lows in the teens on the Northshore Wednesday night.
Carrie Feibel of Houston Public Media explains the Texas abortion appeal.
The Fifth Circuit Court of Appeal in New Orleans is hearing two Texas cases that are drawing local and national attention. One later Wednesday involves restrictions on abortion clinics, and another set for a hearing Friday involving same-sex marriage.
Neighborhood groups came out strongly on Tuesday against a massive overhaul of the codes governing new development in New Orleans, setting the stage for fights over new condominiums along the Mississippi River, the spread of live music into quiet neighborhoods and the delicate balance between economic growth and residents' wishes.
The groups paid for a new billboard near City Hall calling on city leaders to "Fix the CZO!," a reference to the new 600-plus page comprehensive zoning ordinance under review. The City Council is expected to adopt the new codes this year.
The countdown to Mardi Gras is under way in New Orleans.
Mayor Mitch Landrieu planned to note the beginning of the Carnival season with a news conference today. It's planned at a riverside warehouse where many of the floats for Carnival parades are on display.
And revelers known as the Phorty Phunny Phellows scheduled their annual streetcar ride through town tonight. It's a decades-old tradition marking the 12th night after Christmas and the official start of the season.
The newest members of Louisiana's congressional delegation are officially taking their seats.
Recently-elected Congressman Ralph Abraham and Garret Graves, both Republicans, will be sworn into office today, along with 56 other freshmen lawmakers from around the country. They will join a growing Republican majority in the House.
Celebrations for the 200th anniversary of the Battle of New Orleans are on tap for next week.
New historical research is revealing how pivotal the victory was.
A big discovery has come from British records. A researcher recently went to London and found a set of secret orders given to General Edward Pakenham, the commander of the British invasion of the Gulf Coast.
The orders directed him to fight on and capture New Orleans regardless of any peace deal with the Americans.
The New Orleans Police Department set out this year to show that the city's 2013 homicide numbers, the lowest in nearly three decades, were not a fluke.
The New Orleans Advocate reports that as of late Wednesday afternoon, New Orleans had recorded 150 homicides in 2014. That’s a marginal decrease from the 156 counted in 2013. Officials say it is encouraging sign.
Homicides fell 19 percent from 2012 to 2013.
City leaders say they had not aimed to reduce the city's murder rate by any specific percentage in 2014.