NAM forecast model for 6am Mar.4th thru 6am Mar.5th. As you can see the Winter mix of sleet and freezing rain progresses rapidly through the state Wednesday night into Thursday morning. The Euro and GFS models have already latched onto this set up. Any accumulations of sleet/freezing rain on roadways and bridges will present travel hazards. Forecast models will still change and fluctuate over the next 72 hours but it appears likely that we're going to see at least some sort of winter weather over the northern portions of southeast Louisiana.
The Del Mar College Department of Natural Sciences STEM Seminar on WEATHER FORECASTING presented on Friday, September 23, 2016 featured KIII TV meteorologist Alan Holt. He described how he comes up with the numbers such as low and high temperatures, determines mugginess, or predicts sunny or cloudy conditions in his local daily forecast.