Severe Weather Outlook for 2020/21 season

13 Oct 2020 / Australia

The Australian Bureau of Meteorology (BOM) has released a forecast for severe weather, including Tropical Cyclones, for 2020 / 21. The cyclone season in Australia runs from 1 November to 30 April.

An average to slightly-above-average number of tropical cyclones are expected for the 2020–21 Australian tropical cyclone season. On average, there are 9 to 11 tropical cyclones each season in the Australian region, four of which typically cross the coast.

La Niña conditions in the tropical Pacific Ocean and average to warmer-than-average ocean temperatures to the north of Australia have influenced this year's tropical cyclone outlook. In La Niña years, the first cyclone to develop across the Australian region typically occurs earlier than normal, around the middle of December. During average years, the date of the first tropical cyclone to make landfall over Australia is typically in early January.

At least one tropical cyclone has crossed the Australian coast each season since reliable records began in the 1970s.

Cyclone formation is rarely spread evenly throughout the season; often quiet periods are followed by bursts of activity. Tropical lows that do not intensify into cyclones, or lows that are the remnants of older cyclones, can still produce damaging winds, widespread rainfall, and dangerous flooding. These impacts can extend beyond the tropics into southern areas of the country.

The number of tropical lows that form during La Niña years is typically greater than the number which form during non-La Niña years.

Further details can be found at http://www.bom.gov.au/climate/cyclones/australia/#tabs=Outlook

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