Gone is the bullhorn. Instead, New York City emergency management officials have turned high-tech, using drones to warn residents about potential threatening weather.

With a buzzing sound in the background, a drone equipped with a loudspeaker flies over homes warning people who live in basement or ground-floor apartments about impending heavy rains.

“Be prepared to leave your location,” said the voice from the sky in footage released Tuesday by the city’s emergency management agency. “If flooding occurs, do not hesitate.”