BACOLOD CITY—A sudden whirlwind struck coastal areas in Hinigaran, Negros Occidental, early Thursday, leaving 20 houses partially damaged, Hinigaran Mayor  Grace Arceo said. The roofs of the affected houses were blown off, she said. The Provincial Disaster Risk Reduction and Management Office (PDRRMO) said the incident occurred at around 6:45 a.m., catching residents by surprise as swirling winds