ABC News | Perth wakes to blanket of smoke from prescribed burns in WA's south ABC News Perth has woken to a smoky morning, with a trough along the west coast bringing low cloud and trapping smoke from fires in Western Australia's south. The smoke is the result of prescribed burns carried out in the South West — as far away as Walpole ... Smoke from controlled burns, low-level cloud blankets Perth in grey haze South West burn-offs prompt Perth smoke alert |