MALOLOS CITY: A tornado hit some areas in Bustos, Bulacan on Friday, ripping off roofs of at least four houses. The Municipal Disaster Risk Reduction and Management Office said houses in Maharlika, Barangay Poblacion were damaged by the tornado amid a thunderstorm. At least five families were affected by the incident, with rains soaking their belongings due to hours of rains on Friday. No casualty was recorded. The tornado, a general term used to refer to any rotating column of air or water, usually occur during severe thunderstorms when warm and moist air interact with cool and dry air that cause instability, the weather bureau said.