Saturday afternoon, between 430 and 600 pm, what appeared to be a smoke plume was visible on the NWS MKX WSR-88D reflectivity image. The plume more than likely originated from Jefferson Marsh, just to the west of the radar, where a fire was reported.
Warmer temperatures, strong southwest winds, and low relative humidity did make the area more susceptible to fire weather danger on Saturday. However, fuels (grass, trees, brush, etc.) were not dry enough, temperatures were not high enough, and the relative humidity was not quite low enough for fire weather to pose a large threat.
The loop below shows the strong southwesterly winds carrying the smoke away to the northeast. The loop begins at 426 pm and goes through 533 pm.