an arctic cold front rolled in at around four in the afternoon.
It had been almost 90degrees, clear blue sky, light breeze
then, this horizon-spanning BLACK wedge swept down from the northwest.
It was dark enough by 430pm that the streetlights came on.
the temperature dropped about 40 dergees in one hour.
it snowed that night.
That really is bizarre weather. I have heard of extreme weather changes that occasionally happen out west but I would not expect to ever see it snow in New Orleans. I think it is great that you remembered the date.