New York City Mayor Zohran Mamdani said schools will either remain open for in-person instruction on Monday or shift to remote learning if school buildings are closed.
Police say they were notified by authorities in Michigan that Anthony McRae was found with a note in his pocket that indicated a threat to two schools.
"This is considered an extreme weather event," the governor said. "That means it's dangerous. It also means it's life-threatening."
Nanuet High School was closed Wednesday, on what was supposed to be the first day of classes, because of an issue with the main sewer discharge line.
Families and students are hoping their actions will help reverse a decision that's threatening to close a Queens school that was founded eight decades ago.
Two private schools in New York City announced their schools are closing on Friday due to coronavirus concerns.