A much colder air mass will move into southern Mississippi and southeast Louisiana, beginning on New Years Eve, with a prolonged period of much below normal temperatures expected to remain in place through at least Friday of next week.
Overnight low temperatures will be especially cold with lows in the middle and upper teens Monday and Tuesday nights. Low temperatures Wednesday and Thursday nights will not be quite as cold, but most areas will still be well below freezing. Daytime high temperatures will be roughly 20 degrees below normal, and have trouble getting past 40 degrees New Years Day and Tuesday. Highs will only be slightly warmer Wednesday and Thursday.
As the cold air arrives Sunday, precipitation will be departing the area, but there could be a brief period of a wintry mix of precipitation as the precipitation ends Sunday evening. If this occurs, it would likely be to the north of Interstates 10 and 12. No significant accumulation is expected.