As cold air continues to move into the region, a mix of sleet and or snow is possible in some northern parishes close to the Mississippi State line.

A freeze warning is in effect for Southern Mississippi parishes and Louisiana parishes including Washington, St. Tammany, Tangipahoa and St. Helena.

Earlier today, sleet fell across portions of the southshore even as temperatures remained in the 40s and low 50s.

Sleet is a form of frozen precipitation. It can occur two ways. Today it looks as though rain in the middle levels of the atmosphere may have changed over to sleet through evaporational cooling as it fell through a dry layer of air in the lower atmosphere.
Sleet can also form if there is really, really cold (below freezing) air in the upper levels of the atmosphere, but a warm layer of air in the middle of the atmosphere. The precipitation falls as snow, then it partially melts as it falls through a layer of air that is above freezing, then it refreezes in a layer of subfreezing air before it reaches the surface.

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