BACOLOD CITY, NEGROS OCCIDENTAL, Philippines — Over 15,000 Negrenses have to spend Christmas and possibly the rest of the holidays in evacuation centers as Mt. Kanlaon continued to be restive since it erupted on Dec. 9. On Tuesday, the volcano emitted voluminous ash from 11:37 a.m. to 11:48 a.m., rising 1,200 meters tall, and followed