Australia: High temperatures likely to persist over most of the country through at least Dec. 9 /update 2

High temperatures are likely across much of mainland Australia through at least Dec. 9. The Australian Bureau of Meteorology (BOM) has forecast extreme heatwave conditions (the highest level on a three-tier scale) across parts of eastern and northern Western Australia, southwestern Northern Territories, northwestern South Australia, and far northern Queensland Dec. 5. Severe and low-intensity heatwave conditions are expected across much of the rest of the interior of Australia Dec. 5-6, before becoming predominantly confined to eastern and northern regions Dec. 7-9. Maximum temperatures may exceed 45 C (113 F) in central parts of the country through Dec. 6. Temperatures of over 42 C (108 F) are possible in interior parts of New South Wales and southwestern Queensland as the heat persists in the east Dec. 7-9.

The extended period of oppressive heat and dry conditions may produce ideal circumstances for bushfire growth throughout the region. Heatwaves also threaten vulnerable groups - such as the elderly, children, pregnant women, and those with respiratory illnesses - due to the increased possibility of heat stroke or heat exhaustion during prolonged exposure to high temperatures. These health risks could also extend to relatively healthy individuals during significant heatwave events. In addition to significantly impacting athletes and those who work outdoors, high temperatures can cause problems for people using mass transit. The lack of air conditioning and cramped vehicles during rush hour may lead to some passengers' hospitalization.

Very high temperatures may damage road surfaces, and overheated vehicles may worsen traffic problems in urban areas where congestion is already a problem. Commercial trucking disruptions might occur, as very high temperatures put more stress on vehicles, making tire blowouts more common. Major flight disruptions are unlikely at regional airports, but general aviation disruptions are possible, and some airfreight carriers could reduce cargo loads. High temperatures could lead to an increased demand for electricity, which might trigger localized brownouts or blackouts, exacerbating hazardous conditions when air conditioning is no longer possible.