The city has issued a snow alert for Thursday afternoon as the first snowfall of the season is expected to drop up to an inch on the five boroughs.

The Department of Sanitation’s alert is for noon in the Big Apple, according to a posting by the city agency on Wednesday.

“In a snow alert, DSNY coordinates with NYC Emergency Management and the Department of Transportation on snow clearing protocol in accordance with each agency’s written snow plan,” the Sanitation Department said.

“All relevant city agencies have been notified of the snow alert. DSNY will continue to monitor forecasts and will provide updates as the snow event approaches.”

Thursday afternoon is expected to bring a wintry mix of snow, sleet and rain in the city, accumulating from a coating up to an inch, according to AccuWeather.

The Department of Sanitation says an accumulation of a coating to up to 3 inches is expected.

The weather service has forecast the temperature high at 36 degrees and the low at 34.

“It’s going to come in as a sloppy combination of snow, sleet and rain,” AccuWeather senior meteorologist Bob Larson told The Post on Wednesday, noting that the storm is coming in from the south.

“The wintry mix becomes all rain by late afternoon or early evening,” said Larson.

And the rain is not expected to stop until Friday morning as temperatures are expected to rise into the 40s.

As for Thursday, the above-freezing temperatures will likely prevent snow from sticking to the ground.

“The sidewalks will simply be wet,” Larson said. “It’s going to rain very heavily.”

Larson added, “On tops of trees, cars, on the grass in Central Park, there will be an inch of slushy snow and sleet.”

Outside of the city, conditions are expected to be worse.

Interior parts of New Jersey, including Bergen, Union and Essex counties, are forecast to get 1 to 3 inches of slushy snow.

Parts of upper New York like Westchester and Orange counties are expected to experience similar conditions.

Areas farther north toward Albany could see up to 6 inches of snow.

Meanwhile, the city Department of Transportation in conjunction with the Department of Sanitation said alternate-side parking regulations will be suspended Thursday to facilitate snow operations.

Payment at parking meters, however, will remain in effect throughout the city.

Larson noted that it’s uncommon to experience a snowstorm or mixed precipitation in November, but “this is one of those years where it’s coming in early.”