Sneaux next week [Historic snowstorm in southeast Louisiana on January 21, 2025]

I had mentioned they may want to get a room at/near Airport Tuesday and just post up there til flight. Because if you have to be at Airport by 9am, leaving NS at 730 am, temps still below 30, could be an issue since you only have 55 or Causeway ( have Twin spans, but that adds another 60 min to drive - and multiple bridges/overpasses to travel )

Thats if the flight will even happen. I dont know if MSY has the "de-icing" equipment needed.
The occasion I mentioned was about needing to board a flight for a ski trip. As you suggested it would be extremely advantageous to stay near the airport the night before a flight during one of these 'wintry mix' events because you should expect a lot of routes to MSY to be closed.

And just for the record, the ground crew at the airport DID de-ice our aircraft before takeoff. I actually recorded it from my window seat.