PADANG, Indonesia — The death toll from last week’s catastrophic floods and landslides in parts of Asia surged past 1,500 Thursday as rescue teams raced to reach survivors isolated by the disaster, with hundreds of people still unaccounted for across the region. The latest figure came as meteorologists in Indonesia warned of renewed rainfall across North Sumatra, West Sumatra and Aceh provinces in coming days, raising fears of further devastation in areas already reeling from deadly floods. The