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PITTSBURGH (KDKA) — Some warmer days are coming next week, but for now, parts of western Pennsylvania are under a frost advisory.

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Areas affected by the frost advisory include Armstrong, Indiana, Mercer, Venango, Lawrence, Butler and Clarion counties. The advisory is in effect from 12:01 a.m. until 9 a.m. Sunday.

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The National Weather Service says temperatures could fall into the low to mid-30s overnight and unprotected vegetation may be damaged or killed.

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Parts of Ohio and northern West Virginia also fell under the frost advisory.