Pittsburgh, PA — A sharp overnight cooldown will drop temperatures into the upper 20s to low 30s by early Sunday, prompting Freeze Warnings and Frost Advisories for parts of eastern Ohio, northern West Virginia, and southwestern Pennsylvania.
The National Weather Service in Pittsburgh says the alerts run from midnight through 9 a.m. Sunday, with the highest likelihood of frost and freezing conditions north and east of the Ohio River. Slightly milder readings are expected in and around Pittsburgh and along the immediate river corridors.
Officials urge residents to safeguard tender vegetation and any exposed plumbing as the season’s first notable cold snap settles in. On NWS maps, areas shaded in dark blue indicate a Freeze Warning, while light blue denotes a Frost Advisory—both signals that unprotected plants and outdoor pipes could be damaged by the cold.
Forecasters note that clear skies and calm winds overnight will enhance radiational cooling, allowing frost to form more readily in sheltered valleys and low-lying spots. A coating of frost is possible around daybreak Sunday before temperatures moderate later in the day.
To reduce the risk of damage, cover or bring in outdoor plants, disconnect and drain garden hoses, and insulate exterior faucets or vulnerable plumbing in unheated spaces.
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