The National Weather Service was investigating the possibility that a tornado was responsible for ripping the roof off a building in Montebello Wednesday morning.
It capped a period of wild weather in California that brought high winds and warnings of tornadoes and waterspouts.
Video sent to KTLA-TV showed a dark cloud funneling over the Montebello area, while footage from the station’s own news helicopter showed the roof of the structure on South Vail Street with gaping holes, beams and the interior of the building open to the elements.
An employee removes his bicycle from his damaged car at the Royal Paper Box Co. in Montebello.
(Allen J. Schaben/Los Angeles Times)

An employee who was inside the Royal Paper Box Company when the roof was ripped off during a loud micro blast, removes belongings from his damaged car in Montebello.
(Allen J. Schaben/Los Angeles Times)

A pickup truck bed liner is lodged in a tree as employees survey the damage in Montebello.
(Allen J. Schaben/Los Angeles Times)

Cleanup crews remove debris lodged under a pickup truck in Montebello.
(Allen J. Schaben/Los Angeles Times)

Workers remove broken glass from a window at a building in Montebello.
(Allen J. Schaben/Los Angeles Times)

Crews clean up debris after a possible tornado struck Montebello.
(Allen J. Schaben/Los Angeles Times)

Cleanup crews remove a large piece of debris that was strewn along Maple Avenue.
(Allen J. Schaben/Los Angeles Times)

The rear window of a car is broken from the weather event on Wednesday.
(Allen J. Schaben/Los Angeles Times)