NEW YORK — A winter storm that has already left areas of the South with more than 6 inches (15 centimeters) of snow moved into the Northeast on Friday during the morning commute and prompted many school districts to close for the day.

Massachusetts Gov. Charlie Baker urged people to stay off the roads and take public transportation if possible, as the storm was forecast to drop as much as a foot of snow in coastal areas of the state.

There were already 12 inches (30 centimeters) of snow in Hebron, Connecticut and 10 inches (25 centimeters) in Burrillville, Rhode Island by 8 a.m., according to National Weather Service spotters.

Schools in Boston closed, and Providence, Rhode Island, public schools switched to distance learning, but New York City kept the nation’s largest public school system open.

“Children need to be in school. We don’t have any more days to waste” after the many closures and remote-learning days of the pandemic, said New York Mayor Eric Adams, a Democrat dealing with his first major storm after taking office Saturday. He said he was also mindful of children who rely on in-school meals and working parents who can’t stay home.

Officials urged caution on the roads and reduced speed limits in some areas.

A commuter bus spun out of control and wound up blocking multiple lanes on the Massachusetts Turnpike just outside Boston early Friday. No injuries were reported, but the bus caused a huge traffic jam.

New Jersey Gov. Phil Murphy on Thursday night declared a state of emergency for the entire state and delayed opening state offices for nonessential employees until 11 a.m.

Philadelphia and Newark Liberty International airports reported many flights were canceled or delayed. Travelers were advised to check with their airlines.

From late Thursday through Friday afternoon, 4 to 7 inches (10 to 18 centimeters) of snow were expected in parts of central and southern New Hampshire, and south-central and southwest Maine, according to the weather service.

The storm brought record-setting snow to some areas of the South on Thursday.

Nashville saw 6.3 inches (16 centimeters) of snowfall Thursday, shattering the city’s previous Jan. 6 record of 4 inches (10 centimeters) that had stood since 1977, the National Weather Service said. Freezing rain and sleet coated areas around the Tennessee-Alabama state border, said Scott Unger, a meteorologist for the service in Nashville.

Kentucky Gov. Andy Beshear closed state offices at noon Thursday and later extended the closure through Friday.

The largest snowfall in Kentucky by Thursday evening was 8 to 9 inches (20 to 23 centimeters) in a swath from Elizabethtown to Bardstown and Nicholasville to Lexington, said meteorologist Brian Schoettmer of the weather service’s Louisville office. Eastern Kentucky recorded 6 to 8 inches (15 to 20 centimeters), and far western Kentucky had about 3 inches (8 centimeters).