"A very cool and dry air mass will continue to move into the area," The National Weather Service said in an advisory for Friday. "Temperatures are expected to plummet near daybreak Friday and a few hours of freezing temperatures are expected."
Forecasters issued a Freeze Warning statement for the Northshore.
"Temperatures are expected to fall below freezing for a few hours toward daybreak Friday across Southern Mississippi and portions of Southeast Louisiana that are generally along and north of a line from St. Francisville to Hammond to Slidell to Pascagoula."
A freeze warning means that sub-freezing temperatures are imminent or highly likely.
"These conditions may kill crops and other sensitive vegetation," the weather service says.