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Showers & storms are affecting the tropics in unseasonably humid winds. A front is helping cause wind to strengthen in southwest WA & storms to develop in southern WA. A low is generating large swell & brisk winds on the NSW coast. A high is clearing Vic, Tas, SA & the interior.
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Today, 1:18AM UTC
Hazardous surf and chilly air hitting NSW as Tasman Low spins
A large low pressure system sitting over the Tasman Sea is sending large waves and cold air towards New South Wales, resulting in hazardous surf and some of the lowest temperatures so far this year. The satellite images below show cloud spiralling around the Tasman Low on Monday morning, with air circulating in a clockwise direction around the centre of the low pressure system. Image: Day/night satellite images captured early on Monday, April 20, 2026. Source: Weatherzone. Due to this clockwise rotation, the Tasman Low is causing cool southerly winds to flow over southeastern Australia. These winds are also causing a big southerly swell to impact the NSW coast. Wintry temperatures The cool air being driven over NSW by the Tasman Low has caused a string of frosty mornings over the last few days. Monday morning’s -6.0°C at Cooma Airport was the lowest temperature reliably recorded anywhere in mainland Australia so far this year. It was also Cooma’s coldest April morning in 20 years. Canberra dipped below 0°C on each of the last three mornings, reaching -1.8°C on Saturday, -1.0°C on Sunday and -0.9°C on Monday. This was the first time Canberra has seen three consecutive April mornings below zero degrees for four years. Parts of Western Sydney cooled to around 5 to 7°C on Monday morning, which is 3 to 6°C below average for April. This followed similarly chilly temperatures over the weekend for the city’s west. Big waves hitting the coast Winds associated with the Tasman Low have caused big waves along the NSW coast over the last few days, with this large surf continuing on Monday. Significant wave heights have been hovering around 2 to 3 metres along much of the NSW coast since Saturday, with maximum wave heights reaching about 6 to 7 metres at times. A waverider buoy near Sydney registered 6 metre waves early on Sunday morning, followed by a 5.8 metre wave on Sunday night. Image: Significant wave height forecast for Monday morning. Source: Weatherzone. As of 11 am AEST on Monday, a hazardous surf warning was in place for the entire NSW coast, and for southeast Queensland as far north as K’gari (formerly Fraser Island). This warning means conditions are likely to be hazardous for coastal activities such as rock fishing, boating and swimming. Severe weather warnings are also in place for damaging surf on Norfolk Island and Lord Howe Island on Monday. Looking ahead, waves will ease along Australia east coast during the next few days as the Tasman Low weakens and moves over New Zealand’s North Island. Overnight temperatures will also climb as southerly winds ease, allowing warmer air to return to southeastern Australia.
18 Apr 2026, 11:46PM UTC
Another low barrelling towards northern New Zealand
After ex-Tropical Cyclone Vaianu dumped hundreds of millimetres of rain and generally wreaked havoc over northern New Zealand last week, another deep low pressure system is heading towards the region, this time from the south. This latest low has been lingering to the southwest of the country for the last two days, swinging troughs and rain bands east, including one that caused heavy rain, slips and evacuations in the Whanganui region overnight. The low is now set to take a northward track over the North Island and upper South Island. Heavy rain and southerly gales are expected, most likely on Monday and Tuesday and for regions around Wellington, Manawatu-Whanganui, Marlborough and Kaikoura. Though, with terrain as complex as New Zealand's, combining with the small scale of this weather system, specifics could change. It is most likely though that the worst affected regions will be away from Northland (that bore the brunt of Vaianu last week). However, the northeast South Island has also seen rainfall anomalies exceeding 300% in the last two weeks, and it is likely to see more heavy falls with this coming system. Image: Animation showing the ECMWF forecast rain, wind and MSLP in 6 hourly timesteps through to Tuesday midnight. Image: Accumulated rainfall Saturday midnight to Tuesday midnight, according the to the ECMWF model.
17 Apr 2026, 10:27PM UTC
Coldest morning since last winter over inland NSW, SA and Vic
The coldest morning since last winter has eventuated over inland NSW, SA, Vic, and also parts of the ACT. The coldest temperature was recorded at Perisher, with –5.5°C, though Goulburn's -4.1°C wasn’t far behind, the non-alpine centre once more holding its own in the cold morning stakes. Other cold minima around the region included: -2.3°C at Orange, the coldest since last winter and coldest for April since 2008 -1.6°C at Coonawarra, the coldest since early spring, 2025 and the coldest for April since 1999 0.9°C at Renmark, the coldest since last winter and the coldest for April since 2024 1.4°C at Hay, the coldest since early last spring and the coldest for April since 2024 -1.8°C at Canberra, the coldest since last spring and the coldest for April since 2021, with Perisher and Goulburn's corresponding stats being: Perisher: -5.5C, coldest since just December and coldest for April since 2019 Goulburn: -4.1, coldest since last winter and coldest for April since 2008 These values are representative of many other locations throughout the surrounding regions. The cause of the cold was a very dry and cool airmass behind a cold front that skimmed southeast Australia on Friday. The front wasn’t strong enough to bring much wind beyond coastal areas, yet the injection of cool and dry air led to ground surfaces very efficiently radiating heat back to space overnight. It's a stark change from the recent summer when blankets of humidity layered through the atmosphere prevented such radiation and led to consistently very mild nights. Image: Cold front skirting southeast Australia on Friday, 17th April, introducing cool SW'ly winds that quickly dropped as a high pressure system ridged in, bringing very dry air. The combination of cool, dry air and light winds is a classic set up for cold mornings. Source: Bureau of Meteorology Image: Forecast dewpoints (a measure of humidity) at around 1500m about the ground, surface winds and MSLP over southeast Australia at dawn on Saturday, 18th, April, showing large very dry (purple) areas that allow that Earth’s surface to effectively lose heat overnight. Source: Weatherzone Moving into Sunday, the cold temperatures will contract east and spread north with the driest, coolest air, as predicted yesterday. The latest satellite and synoptic imagery show the northern tail of the cold front is now near the NSW, Qld border, allowing the cold dry air to follow suit. It will then start to dissipate early in the new week.