:0000 UTC (1000 AEST) – TCWC Brisbane reports that Tropical Low 06U previously located near Mornington Island, has intensified into a Category One Tropical Cyclone and has been named as Cyclone Charlotte.
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:1200 UTC (2200 AEST) – Tropical Cyclone Ellie makes landfall on Mission Beach, Queensland in Australia.
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:1800 UTC (0300 WDT, 20 December) – Cyclone Billy makes landfall near too Wyndham.
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:0600 UTC (1600 AEST) – TCWC Darwin reports that Tropical Low 06U has formed near to Mornington Island within the Gulf of Carpentaria.
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