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A front passing close to Tas and a strong high pressure ridge building over the mainland are directing brisk and showery westerly winds over southern SA, Vic, Tas and southern NSW. A trough is bringing showers to Qld. The high is keeping the remaining mainland clear and dry.
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Today, 2:31AM UTC
Two spectacular cloud formations over Australia
Thursday morning’s satellite image over Australia revealed two spectacular cloud formations – one on a vast scale, the other localised but just as striking when viewed at closer range. The main cloud feature is the narrow, curved cloudband trailing thousands of kilometres across Queensland and the eastern NT behind a broad mass of cloud near the centre of a low pressure system over the Tasman Sea. The less obvious feature is a series of roll clouds over the waters of the Gulf of Carpentaria between western Cape York and Arnhem Land in the Northern Territory. Let’s look at these two cloud patterns separately and briefly discuss how they formed. Vast curved cloudband from the Tasman Sea to the eastern NT Image: The vast arc of the cloudband clearly visible over NE Australia at 8 am (AEST) on Thursday, August 13, 2026. Source: Weatherzone. The long cloudband was caused by the decaying cold front that passed through southeastern Australia on Wednesday. The cloudband marks the boundary between warm air and relatively cooler air. When the cooler, more dense air wedges underneath the warmer air ahead of it, it causes the warm air to rise, cool and condense into clouds. But why is it curved? It’s all to do with the Coriolis force, an effect caused by the fact that Earth rotates faster at the equator than it does at the poles. The Coriolis force is an apparent deflection of moving objects which are not firmly connected to the ground – such as wind, cloud and ocean currents – to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. As Weatherzone meteorologist Joel Pippard explains: "If air moves from the South Pole toward the equator, it starts with a slow eastward speed. The ground underneath it starts spinning faster to the east, making the object fall behind and curve to the left. “Since the cold front came from the south (closer to the poles) it was rotating around the earth slower than if it was near the equator. As the front pushed north, it moved slower than the earth underneath it. That meant that the cloud furthest north travelled to the east slower than the cloud further south, creating the arc shape.” Roll clouds in the Gulf of Carpentaria Image: Satellite loop over the Gulf of Carpentaria and nearby parts of northern Australia, showing roll clouds moving NW across the gulf in the six hours to 9:30 am (AEST) on Thursday, August 13, 2026. Source: Weatherzone. A series of roll clouds developed in the very early hours of Thursday morning over the Gulf of Carpentaria. As Weatherzone meteorologist Ben Domensino explains, the distinctive, pipe-shaped cloud formations were caused by atmospheric gravity waves that formed over far western Queensland on Wednesday. "Atmospheric gravity waves act like ripples on the surface of a lake, with air rising and sinking as the waves propagate through the atmosphere," Domensino explains. "When air reaches the top of each wave crest, it cools to form cloud through condensation. When the air sinks again into the wave trough, the air becomes warmer and dries out. This rising and sinking pattern causes parallel rows of tube-shaped clouds along the gravity waves. These are roll clouds." Image: Closer view of the development of the roll clouds over a 12-hour timeframe from 9:30 pm (AEST) on Wednesday, August 12 to 9:30 am (AEST) on Thursday, August 13, 2026. Source: Weatherzone. Nowhere else on Earth do roll clouds occur with such consistency as over the Gulf of Carpentaria. For that, we can largely thank the Cape York Peninsula. During the daytime heating that occurs over the tropical peninsula, westerly sea breezes from the Gulf of Carpentaria and easterly sea breezes from the Coral Sea clash during the evening, forcing air upwards. Gravity then pulls the dense air back down, fuelling the atmospheric gravity waves.
12 Aug 2026, 3:03AM UTC
Last wintry burst for at least a week across southeast Australia
After heavy rain on the weekend and a spell of cooler, windy conditions in the first half of the working week as a pair of cold fronts surged across the southeast, a period of drier, stable, warmer weather lies ahead for much of the country’s most heavily populated corner. There are even signs of an unseasonable spike in warmth early next week, with Melbourne and Adelaide expected to peak around 20°C next Tuesday. But before that happens, residents of both cities will have to cope with wintry weather this Wednesday. Let’s take a closer look at today’s conditions before focusing on what’s in store from the end of the week onwards. Cold, wintry conditions in Melbourne, Adelaide, Canberra and the high country Melbourne and Adelaide can both expect maximums of around 15°C this Wednesday. That’s exactly the long-term August average maximum temperature for Melbourne, and a degree or so below it for Adelaide. Showers are also part of today's mix for both cities in the unstable westerly airstream behind a “decaying” (or weakening) cold front, which surged across Victoria, southern NSW and Tasmania on Wednesday morning. Image: Rain radar and atmospheric water vapour loop across SE Australia for the six hours to 11 am (AEST) on Wednesday, August 12, 2026. Source: Weatherzone. Because it's located east of the mountains, Canberra rarely receives much (or any) rainfall from relatively weak cold fronts like this one, as there’s precious little moisture remaining once the cool airmass has crossed the mountains. But the national capital is still enduring a relatively chilly Wednesday, with a maximum expected around 13°C (long-term August average 14.4°C) with apparent or "feels like" temperatures that will stay well into single digits all day due to those gusty westerlies. In the alpine region, snow showers are falling above about 1400 metres this Wednesday, after overnight accumulations of around five centimetres at the higher resorts. The snow flurries should persist till this evening, but they will likely be the last fresh flakes of any significant quantity for at least a week. Image: A little fresh snow at Charlotte Pass, NSW, on the morning of Wednesday, August 12, 2026. Source: Fozzie Bear via ski.com.au. Warmer and drier in Vic, SA, ACT before wet spell dampens east coast While a shower or two may persist for a day or two in coastal areas of Victoria and southeastern SA, days will gradually warm up with drier conditions setting in as the week progresses. But for Sydney and Brisbane, the reverse is likely. The east coast tends to be insulated from the harshest conditions associated with winter cold fronts that cross the southeast of the continent – and as Weatherzone meteorologist Jess Miskelly points out, westerlies tend to warm when running down the slopes of the Great Dividing Range towards the east coast. For example, despite gusty westerlies in Sydney this Wednesday, the harbour city should still reach 20°C, after topping 21°C on Tuesday. Highs of 20°C are also expected on Thursday and Friday. But on the weekend, winds will swing around to the southeast and Sydney maximums will drop by a degree or two as a period of showery weather sets in that could last into at least the middle of next week, as moist Tasman Sea air pushes onshore. Image: Precipitable water and mean sea level pressure forecast for 10 pm (AEST) on Saturday, August 15, 2026, according to the ECMWF model. Brisbane will also likely see a spell of showery weather from Sunday through to at least Tuesday.
11 Aug 2026, 5:14AM UTC
Major flood risk in northern Victoria
Floodwaters continue to flow through rivers in central and northern Victoria following torrential rainfall over the last few days, with a risk of major flooding at Wangaratta this Tuesday. A powerful cold front interacting with a moisture-laden cloudband delivered widespread and heavy rain in Victoria between Saturday August 8 and Monday August 11. This included more than 100 mm in numerous rain gauges across the state’s northeast during the 24 hours to 9am on Monday, including 166 mm at Mt Buffalo Chalet and 127 mm at Cheshunt. The system that caused this deluge has now cleared from southeastern Australia and will move out over the Tasman Sea on Tuesday. However, the huge amount of water left in its wake continues to cause flooding in Vic. At 2:30 pm AEST on Tuesday, moderate flooding was occurring in the Loddon, Ovens and Keiwa Rivers and Seven Creeks. Image: River height observations for the Ovens River at Wangaratta, Vic. Source: Bureau of Meteorology. The Ovens River at Wangaratta reached 12.64 m at 1:15 pm on Tuesday, just below the major flood level of 12.7 m. According to the Bureau, the river should remain around the major flood level on Tuesday afternoon and may briefly exceed it. Looking ahead, another cold front will spread showers across southeastern Australia on Wednesday, including Victoria. This system will be much weaker than the previous front and its rainfall will be considerably less. Fortunately, flood-affected areas in Vic should only see a few millimetres of rain from Wednesday’s front, which won’t be enough to cause further flooding.