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Today, 5:02AM UTC
New provisional high pressure record for Australia
A weather station in Tasmania has just recorded what could be the highest mean sea level pressure on record in Australia. According to data from the Bureau of Meteorology, a weather station at Ouse, Tas registered a mean sea level pressure of 1044.5 hPa shortly before 10 am AEST on Monday, July 6, 2026. This is provisionally the highest mean sea level pressure on record in Australia, beating the previous record of 1044.3 hPa at Launceston on June 7, 1967. Image: Weather observations from Ouse, Tas on the morning of July 6, 2026, showing mean sea level pressure reaching 1044.5 hPa at 9:50 am. Source: Weatherzone. What is mean sea level pressure? The term mean sea level pressure (MSLP) refers to the atmospheric pressure adjusted to Earth’s mean sea level at a given location. It is calculated by taking observed air pressure at the Earth’s surface and then adjusting it to what the pressure would be at Earth’s mean sea level. MSLP is commonly used by meteorologists because it normalises air pressure to a single level, allowing pressure systems to be compared and mapped across the planet on a synoptic chart. Areas of high MSLP are referred to as high pressure systems and are usually associated with calm and dry weather. Air descends towards the surface at the centre of high pressure systems, which is why the surface pressure becomes higher relative to the surrounding atmosphere. By contrast, areas of low atmospheric pressure – commonly referred to as low pressure systems – are characterised by rising air, low surface pressure and stormy weather conditions. Image: Modelled mean sea level pressure over Tas at 10 am AEST on Monday, July 6, 2006. Source: Weatherzone. Why was the air pressure so high in Tasmania on Monday? Monday morning's provisional mean sea level record occurred as the centre of a strong high pressure system sat directly over Tas. This high pressure system has been intensified by a deep low pressure system sitting over the Tasman Sea, due to a process called anticyclonic intensification: The low pressure system over the Tasman Sea rapidly intensified on Sunday and Monday while located to the west of New Zealand. Rising air inside this low moved away horizontally once it reached higher altitudes – a process called divergence. The air escaping the low’s upper levels flowed into the upper-levels of high pressure system – a process called convergence – where it then descended towards the surface – also called subsidence. How will this strong high pressure system influence the weather? The clear and calm conditions at the centre of the strong high pressure system caused bitterly cold temperatures on Monday morning. This included Melbourne dropping to 3.2°C, which was its coldest morning so far this year, while Coldstream hit -2.7°C. In Tas, Liawenee’s temperature plunged to -8.1°C shortly after 7 am on Monday morning. Monday’s provisional record-breaking high pressure also meant there was more air sitting above Tasmania. Compared to the global average mean sea level pressure of around 1013 hPa, Monday’s 1044.5 hPa meant there was about a 3% increase in air mass sitting above Ouse. So, if you were feeling a little weighed down on Monday morning, you can blame it on the extra air sitting above your head.
Today, 1:32AM UTC
Melbourne’s coldest night of 2026 as five states fall below zero
Frigid temperatures were recorded overnight across southeastern Australia, as dry, cold air settled over the most heavily populated corner of the country in the wake of a cold front. Let’s whip around the southeastern states to see how low the mercury fell on Monday morning: Victoria Melbourne recorded its coldest night of the year with a low of 3.2°C at the main city weather station, while the airport plummeted to just 0.1°C – also its coldest night so far this year. Coldstream, in the Yarra Valley on the far northeastern outskirts of the city, an hour from the CBD, fell to -2.7°C – its coldest night of the year by almost two degrees. Mt Hotham Airport (elevation 1295 m) was the chilliest place in the state with a low of -4.6°C. This was its coldest night of 2026 to date. Tasmania The tiny town of Liawenee, at an elevation of 1057 m on Tasmania’s Central Plateau, shivered through a minimum of -8.1°C. This was Australia’s lowest temperature of July 2026 to date, although it’s worth noting that the town saw three colder nights in June. Hobart had a low of just 2.6°C, its coldest night of July 2026 to date. Ouse, in the Upper Derwent Valley, had its most frigid night in almost two years with a low of -5.5°C. South Australia You usually look to the southeast of SA to find the state’s coldest minimums in winter, but Yunta, in the North East Pastoral forecast district was officially the chilliest spot overnight with a low of -1.7°C. The coldest place in the state’s southeast was the famous wine area of Coonawarra, which fell to -0.3°C. New South Wales As you’d expect, the coldest spot was in the Snowy Mountains, where Perisher Valley fell to –5.6°C. That was good news for the snowmakers, who were able to augment the snowpack by firing up the snow guns after around 30 cm of natural snow fell on Friday. Sometimes in winter, the Northern Tablelands register the coldest NSW nights. In 2023, Glen Innes had Australia’s coldest temperature with a low of –10.8°C. But the influence of moist easterly winds over the state’s northeast prevented subzero minimums this Monday. ACT The minimum stayed a few degrees above zero in Canberra and its suburbs due to the flow of moist winds from the southeast (even though just 0.2mm of rain was recorded at Canberra Airport). It was a different story up in the Brindabella Ranges west of the city, where Mt Ginini stayed dry and registered an overnight minimum of –2.6°C. Why was it so cold overnight? Image: Precipitable water and mean sea level pressure over Australia at 10 pm (AEST) on Sunday, July 5, 2026. Source: Weatherzone. As the map above shows, a strong high pressure system centred over Tasmania caused stable conditions which were perfect for low minimums given the existing cool airmass over most parts of southeastern Australia. Only the east coast and some nearby ranges escaped the worst of the chill, due to the onshore flow from the Tasman Sea. Further chilly nights can be expected for at least the first half of the working week across most of the areas mentioned.
05 Jul 2026, 8:05AM UTC
Warnings in place for New Zealand as deep low brings heavy snow, rain to South Island
A deep low pressure system is heading straight for New Zealand, and it's set to bring heavy rain, gusty winds and even blizzard conditions across the South Island late Sunday, July 5, into Monday, July 6, extending into Wednesday, July 8, for the South Island's northeast. Image: ACCESS-G forecast accumulated rainfall to 10pm AEST (midnight NZST), Wednesday, July 8, 2026. Source: Weatherzone. The New Zealand MetService has issued a Red Warning for heavy rain of 80-120mm over coastal parts of Dunedin and Clutha, with rainfall intensity possible reaching as high as 10-15 mm/h. Red warnings are the highest warning category for New Zealand, indicating that people need to "take immediate action . . . to protect people, animals, and property from the impact of the weather". Orange Warnings, which indicate "a potential risk to people, animals and property", have been issued for heavy rain over northern coastal Otago, northern Canterbury and Marlborough, and for heavy snow down to 400 metres (possibly as low as 200 metres) across inland Otago. There is at least a moderate chance that these warnings will be updated to Red Warnings in the next warning update, which is due at 9pm NZST (7pm AEST). Image: Severe Weather Warnings for New Zealand for Sunday, July 5, to Tuesday, July 7, 2026. Source: New Zealand MetService. Earlier today, the New Zealand rain radar showed a taste of what's to come, indicating heavy rain near Ashburton on the South Island's east coast. Image: Rain radar at 3:35pm NZST, Sunday, July 5, 2026. Source: New Zealand MetService. Gusty, possibly damaging, south to southeasterly winds may also develop through the Cook Strait and over the South Island ranges from Monday morning and could persist into Tuesday morning for South Island's northern ranges. Image: ACCESS-G forecast wind gusts at 12pm AEST (2pm NZST) on Monday, July 6, 2026. Source: Weatherzone. As the low crosses New Zealand's North Island later in the week, there is a chance that damaging southerly wind gusts could again develop through the Cook Strait, possibly impacting Wellington, late Wednesday evening into Thursday morning. If you're in New Zealand or plan on travelling to or from New Zealand this week, make sure you stay up to date with all the latest warnings at New Zealand MetService.




