From the National Weather Service:

…FREEZE WATCH IN EFFECT FOR LATE TONIGHT AND FRIDAY MORNING…

.A SURGE OF ARCTIC AIR WILL INVADE SOUTHEAST LOUISIANA AND SOUTH
MISSISSIPPI LATE OVERNIGHT IN THE WAKE OF A STRONG COLD FRONT
THAT WILL PASS THROUGH THE REGION THIS AFTERNOON. A FREEZE IS
EXPECTED ACROSS THE ENTIRE REGION…WITH A HARD FREEZE OCCURRING
ACROSS SOUTH MISSISSIPPI AND THOSE AREAS OF SOUTHEAST LOUISIANA
NORTH OF A MORGAN CITY TO LAKE PONTCHARTRAIN TO PASCAGOULA LINE.

…HARD FREEZE WARNING IN EFFECT FROM 9 PM THIS EVENING TO 9 AM
CST SATURDAY…

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A HARD
FREEZE WARNING…WHICH IS IN EFFECT FROM 9 PM THIS EVENING TO
9 AM CST SATURDAY. THE HARD FREEZE WATCH IS NO LONGER IN EFFECT.
A HARD FREEZE IS EXPECTED ACROSS ALL OF SOUTH MISSISSIPPI AND
THOSE AREAS OF SOUTHEAST LOUISIANA NORTH OF A MORGAN CITY TO LAKE
PONTCHARTRAIN LINE. TEMPERATURES IN THESE AREAS ARE FORECAST TO BE
BELOW 26 DEGREES FOR SEVERAL HOURS WITH SOME LOCATIONS STRUGGLING
TO EVEN GET ABOVE FREEZING DURING THE DAY FRIDAY. IF TEMPERATURES
GET ABOVE FREEZING IT WILL BE FOR ONLY A FEW HOURS WITH
TEMPERATURES BACK BELOW FREEZING RIGHT AROUND SUNSET. LOWS WILL BE
EVEN LOWER FRIDAY NIGHT WITH MANY LOCATIONS POSSIBLY DROPPING INTO
THE MID TO UPPER TEENS.