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Showers, some heavy, along the QLD and NSW coasts with help from persistent, moist southeasterly winds. The odd light shower in TAS's south and east as a weak front skims by. Showers developing over western NSW in a moist airmass. A high keeps elsewhere dry.

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ShowersSydneyNSW

18.4°C

14°C
21°C

SunnyMelbourneVIC

17.2°C

8°C
18°C

Mostly SunnyBrisbaneQLD

23.1°C

16°C
24°C

Mostly SunnyPerthWA

23.1°C

14°C
27°C

Mostly SunnyAdelaideSA

22.8°C

11°C
23°C

Possible ShowerCanberraACT

15.7°C

5°C
17°C

RainHobartTAS

12.0°C

10°C
16°C

Mostly SunnyDarwinNT

31.6°C

23°C
33°C

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Today, 2:26AM UTC

Another wave of rain to soak Australia's east

Widespread rain and thunderstorms will spread over Australia’s eastern inland over the next few days, before drenching already sodden parts of the NSW coast this weekend. The atmosphere above eastern Australia is being loaded with moisture this week thanks to the influence of a stubborn high pressure system centred to the south of the country. Over the next few days, a pool of cold upper-level air will pass over Australia’s southeast and cause some of the moisture in the atmosphere to be converted into rain. If the atmosphere is like a sponge laden with water, the passage of the cold upper-level air is like someone squeezing the water out of the sponge. The animation below shows these two key ingredients interacting over the next few days. The blue and pink colours show precipitable water in the atmosphere, which represents how much moisture is available to convert to precipitation. The white lines show an upper-level low passing over the southeast of Australia, which is associated with a cold pool of air around 6 km above sea level. Video: Composite precipitable water and 500 hPa height contours between Wednesday and Sunday this week, according to the ECMWF-HRES model. Showers and thunderstorms will start to develop over Australia’s eastern interior on Wednesday and become more widespread on Thursday, affecting areas of western NSW and Qld, the northeast of SA and the southern NT. This rain and thunderstorm activity will then spread further east across NSW, southern Qld and parts of Vic from Friday to Sunday, under the influence of the upper-level low. Large areas of western NSW and parts of northern Vic and southern Qld could see 20 to 40 mm of rain from this system, while some areas in western NSW should see 50 to 80 mm. There is also potential for heavy rain and flooding in parts of eastern NSW on the weekend as rainfall rates increase along the coast, pouring more water into already saturated coastal catchments. At this stage, the area most likely to see flooding rain on the weekend will be the Illawarra and South Coast regions, where 2-day totals of 150 to 250 mm are possible, although this may change in the coming days. The map below shows how much rain one computer model is predicting for eastern Australia over the coming week, with most of this rain expected to fall between now and Sunday. Image: Forecast accumulated rain during the seven days ending on Tuesday, May 14, 2024, according to the ECMWF-HRES model. Severe weather and flood warnings will be issued closer to the weekend if computer models are still indicating this flood risk later in the week. Be sure to check the latest forecasts and warnings in your area over the coming days for the most up-to-date information.

07 May 2024, 11:23PM UTC

How severe thunderstorms impact energy infrastructure

Earlier this year destructive thunderstorms and winds equivalent to a category two cyclone lashed Victoria, bending towers and toppling trees and poles.  So, how can thunderstorms damage energy infrastructure, and are these events getting worse?   This event occurred during mid-February 2024, when a strong cold front generated severe thunderstorms and localised wind gusts of 130km/h after a prolonged period of extreme heat. The image below shows a squall line around 1,500km long causing lightning across four states in February.  Image: Himawari-9 satellite image, lightning and radar on Tuesday, February 13 at 3pm AEDT.  The destructive winds were caused by microbursts, which bent towers and toppled trees and poles in Vic, leaving thousands without power.   Image: Damaged transmission towers at Anakie, Source: AAP  Microbursts are a localised column of sinking air (downdraft) within a thunderstorm and is usually less than 4km wide. The cold, heavy air within this downdraft descends rapidly to the surface and then spreads out in all directions as it hits the ground. The image below shows how wind gusts are produced in thunderstorms.    Microbursts can be destructive and cause wind gusts above 100 km/h, which can be a risk for power infrastructure. The force applied to the structure is roughly proportional to the speed squared.  Fierce wind gusts from thunderstorms can:  Knock down trees, which can fall onto power lines  Topple poles  Knock out transmission towers.  Microbursts typically occur during the warmer months of the year and, unfortunately, they can develop rapidly and last for only a short period of time, making them difficult to predict and warn communities about.   Have these thunderstorm events become more severe in Victoria?   The severe thunderstorm season across southern Australia occurs during the warmer months of the year, between November and April.   While thunderstorms are more common across northern Australia, Qld, and NSW, they do occur frequently in the summer months. The map below shows the annual average lightning density in Vic between July 2014 and June 2023, with the most lightning occurring in the northeast high country each year.      Image: Weatherzone’s Total Lightning Network Annual lightning density mean between July 2014 and June 2023.  You can see in the map above that lightning is common to the north of Ballarat near Learmonth and Miners Rest, with the region seeing 37.7 pulses per year. The high country near Benalla and Whitfield recorded an average of 28.1 pulses, Thorpdale in Gippsland saw 24.5 pulses, and Melbourne only 8.2 pulses per year.    Research has shown that the warming climate is increasing the risk of heatwaves and bushfires, which can impact energy infrastructure. Unfortunately, it is unknown how global warming will affect thunderstorms and their associated destructive winds. To research climate change's impact on thunderstorms, we would need quality data that dates back well into history. Unfortunately, detecting lightning is a fairly new phenomena, so a solid climate base to compare data to is not currently existent.   According to the University of Melbourne researchers and Watt Clarity, ‘The evidence we do have suggests continued climate change may potentially increase the risk of extreme winds from thunderstorms. This is partly due to more moist and unstable air, which are essential for thunderstorms to form. We think these conditions could occur more often with climate change, in part because warmer air can hold more moisture.’   Indeed, much of Australia had an unusually stormy summer 2023/24, with Melbourne, Canberra and Brisbane all seeing 5 to 6 extra storm days a season. The map below shows that an unusually high number of thunder days were seen over most of Qld, NSW, SA, Vic, the ACT and Tas during the summer of 2023/24 compared to the average of the most recent nine years.  Image: Thunder day anomalies for summer 2023-24 versus the average thunder days for the nation’s nine most recent summers (2014/15 to 2022/23). 

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07 May 2024, 7:17AM UTC

Sydney halfway through two-week rainy spell

There's some good news but mostly bad news for Sydney folk who are sick of the relentless rain and desperate to get some washing hung out. The good news is that Wednesday's showers should stick to the coastal fringe and nearby suburbs, which means if you live in the city's west, it could be a good day to crank up the Hills Hoist. Overall, however, the picture remains wet, with a continuation of moist onshore winds for at least another week. The whole Sydney basin has seen steady rain, persistent heavy showers, or at least a few drops on each of the first seven days of May 2024, as the figures below demonstrate. Sydney Observatory Hill May 1: 22.8 mm May 2: 23.2 mm May 3: 6.8 mm May 4: 18.6 mm May 5: 21.4 mm May 6: 31.2 mm May 7: 3.0 mm Running total 127.0 mm Penrith May 1: 0.2 mm May 2: 1.0 mm May 3: 0.2 mm May 4: 3.6 mm May 5: 15.4 mm May 6: 10.2 mm May 7: 2.4 mm Running total 33 mm Note that the city’s "official" weather station at Observatory Hill on the fringe of the CBD has recorded considerably more rain than Penrith in Sydney’s outer west, about 60 km away. The pattern of heavy rainfall totals near the coast diminishing quickly as you move inland can be seen on the BoM chart below, which shows the weekly NSW rainfall from May 1 to 7. Source: BoM. But as mentioned, there has still been enough moisture to dampen the ground in most Sydney suburbs every day in May 2024 to date, with the pattern set to continue for another week or so. Indeed, the likelihood of heavy rain will increase heading into Friday and Saturday. Why no break in the weather pattern? Weatherzone meteorologist Ben Domensino wrote a really good explainer on Tuesday about the persistent blocking high pressure systems centred south of the continent which dominated the weather in April. The pattern has continued into May. While strong highs bring mostly dry conditions to southern SA and Vic, as well as western and southern Tasmania due to a lack of strong cold fronts, persistent onshore winds travelling over the Tasman Sea provide moisture for rain and thunderstorms in eastern NSW and Qld. Long story short, none of this is set to change dramatically in the next week. For those who are into records, the ABC reported this week that Sydney's record streak of 1 mm or more of rain recorded at Observatory Hill is 16 consecutive days. That happened in both 1943 and 2022. The current streak could fall just short of 16 days as signs point towards a drying trend early next week, but we'll keep you updated.

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07 May 2024, 11:23PM UTC

How severe thunderstorms impact energy infrastructure

Earlier this year destructive thunderstorms and winds equivalent to a category two cyclone lashed Victoria, bending towers and toppling trees and poles.  So, how can thunderstorms damage energy infrastructure, and are these events getting worse?   This event occurred during mid-February 2024, when a strong cold front generated severe thunderstorms and localised wind gusts of 130km/h after a prolonged period of extreme heat. The image below shows a squall line around 1,500km long causing lightning across four states in February.  Image: Himawari-9 satellite image, lightning and radar on Tuesday, February 13 at 3pm AEDT.  The destructive winds were caused by microbursts, which bent towers and toppled trees and poles in Vic, leaving thousands without power.   Image: Damaged transmission towers at Anakie, Source: AAP  Microbursts are a localised column of sinking air (downdraft) within a thunderstorm and is usually less than 4km wide. The cold, heavy air within this downdraft descends rapidly to the surface and then spreads out in all directions as it hits the ground. The image below shows how wind gusts are produced in thunderstorms.    Microbursts can be destructive and cause wind gusts above 100 km/h, which can be a risk for power infrastructure. The force applied to the structure is roughly proportional to the speed squared.  Fierce wind gusts from thunderstorms can:  Knock down trees, which can fall onto power lines  Topple poles  Knock out transmission towers.  Microbursts typically occur during the warmer months of the year and, unfortunately, they can develop rapidly and last for only a short period of time, making them difficult to predict and warn communities about.   Have these thunderstorm events become more severe in Victoria?   The severe thunderstorm season across southern Australia occurs during the warmer months of the year, between November and April.   While thunderstorms are more common across northern Australia, Qld, and NSW, they do occur frequently in the summer months. The map below shows the annual average lightning density in Vic between July 2014 and June 2023, with the most lightning occurring in the northeast high country each year.      Image: Weatherzone’s Total Lightning Network Annual lightning density mean between July 2014 and June 2023.  You can see in the map above that lightning is common to the north of Ballarat near Learmonth and Miners Rest, with the region seeing 37.7 pulses per year. The high country near Benalla and Whitfield recorded an average of 28.1 pulses, Thorpdale in Gippsland saw 24.5 pulses, and Melbourne only 8.2 pulses per year.    Research has shown that the warming climate is increasing the risk of heatwaves and bushfires, which can impact energy infrastructure. Unfortunately, it is unknown how global warming will affect thunderstorms and their associated destructive winds. To research climate change's impact on thunderstorms, we would need quality data that dates back well into history. Unfortunately, detecting lightning is a fairly new phenomena, so a solid climate base to compare data to is not currently existent.   According to the University of Melbourne researchers and Watt Clarity, ‘The evidence we do have suggests continued climate change may potentially increase the risk of extreme winds from thunderstorms. This is partly due to more moist and unstable air, which are essential for thunderstorms to form. We think these conditions could occur more often with climate change, in part because warmer air can hold more moisture.’   Indeed, much of Australia had an unusually stormy summer 2023/24, with Melbourne, Canberra and Brisbane all seeing 5 to 6 extra storm days a season. The map below shows that an unusually high number of thunder days were seen over most of Qld, NSW, SA, Vic, the ACT and Tas during the summer of 2023/24 compared to the average of the most recent nine years.  Image: Thunder day anomalies for summer 2023-24 versus the average thunder days for the nation’s nine most recent summers (2014/15 to 2022/23). 

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23 Apr 2024, 12:07AM UTC

Wind returning to southeastern Australia

After a prolonged period of light winds, a surge of powerful winds and cool air will push through southeastern Australia during the next 48 hours.  As we wrote about last week the National Electricity Market (NEM) saw very low wind power generation during the seven days leading up to Thursday, April 18, with the daily wind generation having been under 41 GWh/day for this period.  Wind power has improved slightly during the past week, with wind power increasing for a few days over last weekend. The chart below shows that the winds across the NEM have already increased in response to a cold front approaching SA and Vic on Tuesday.  The increase in wind power is associated with a cold front sweeping across southeastern Australia, after a stubborn high-pressure system forced many cold fronts south for over a week.  The map below shows the cold front marching across the Bight, approaching SA on Tuesday morning. You can also see a broad area of speckled cloud in the Bight, which is a tell-tale sign that a large mass of cold polar air has broken away from the Antarctic region and is venturing into the relatively warm mid-latitudes.      Image: Himawari-9 satellite image at 9:30am AEST on Tuesday, April 23.  Northwesterly winds will continue to strengthen ahead of the cold front on Tuesday in SA and Vic before a strong southwesterly change hits Adelaide on Tuesday afternoon and Melbourne in the evening.   The images below show the wind gust forecast for Tuesday and Wednesday afternoon.      Image: Instantaneous wind gust forecast at 1pm AEST on Tuesday (top) (bottom)and Wednesday, April 23 and 24, according to ECMWF  While most of this wind should hit the wind power ‘sweet spot’, cut outs could occur at southeastern Vic and southern NSW wind farms late Tuesday into Wednesday. Generally, cut outs occur when wind speeds exceed 90km/h (25 m/s), which is when the wind turbines are turned off to prevent damage.  In the image above you can see the front and associated southerly change moving up the NSW coast on Wednesday, hitting Sydney on Wednesday afternoon.   Winds will then become light later this week as another high-pressure system moves into the Bight.   Cool change coming  Ahead of this change, much of southeastern Australia has experienced pleasant autumnal weather, with Sydney’s temperature for the next two days reaching 27°C. However, there will be a large temperature contrast ahead and behind the cold front in the next few days. The image below shows forecast air temperatures around 1.5km above sea level on Wednesday morning, showing the cool airmass moving over parts of SA, VIC, Tas.      Behind the cold front strong southwesterly winds will cause temperatures to plummet to around 2-3°C below average across southern Australia;  Melbourne and Adelaide's temperature dropping to around 16-18°C for several days following the front.   Hobart’s temperature will drop from 22°C on Tuesday to 15°C on Wednesday.   Sydney’s temperature will go from 5°C above average on Wednesday to average on Thursday.  The coolest air will move over Tas, bringing snow to the alpine region there.   Looking ahead, temperatures will recover later this week ahead of another cold front and burst of wind power early next week. 

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