A frost advisory has been issued for overnight Wednesday into early Thursday for all of southern Wisconsin, including the Milwaukee metro area.
Inland areas away from Lake Michigan are expected to see the coldest temperatures, said Kevin Wagner, a meteorologist with the National Weather Service in Sullivan.
The frost advisory takes effect at 1 a.m. and continues through 8 a.m. on Thursday. according to the National Weather Service.
"Frost could kill sensitive outdoor vegetation if left uncovered," the weather service said in a statement.
Counties included in the advisory include Milwaukee, Waukesha, Ozaukee, Washington, Dodge, Dane, Jefferson, Racine, Kenosha, Marquette, Green Lake, Fond du Lac, Sheboygan, Sauk, Columbia, Iowa, Lafayette, Green, Rock and Walworth.
"We're going to have light winds and clear skies which will allow temperatures to really cool down," overnight into early Thursday, Wagner said. "Areas immediately along Lake Michigan are going to be a little bit warmer."
This time of year is typically when the area sees its first freezing temperatures, Wagner said.
"We've seen freezes as early as mid-September," Wagner said. "For the first frost advisory, this is pretty on par."
Looking ahead, the forecast calls for temperatures near normal and no rain heading into the weekend.
"It may approach 70 degrees on Saturday," Wagner said. "Overall it's looking to be pretty quiet for us.
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This article originally appeared on Milwaukee Journal Sentinel: First frost expected for southern Wisconsin overnight, early Thursday