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Showers are scattering across southwest QLD, western NSW & far northern VIC with a pool of cold air aloft. Showers persisting along the eastern seaboard in humid easterly winds. A front & low are bringing cool winds & showers to WA's south. A high is keeping much of elsewhere dry
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Today, 3:58AM UTC
Riverina's first rain in a month frustrates some, drenches others
Rain and thunderstorms have been spreading across New South Wales, bringing the first rain in a month and evening drenching some areas, but it has been frustratingly too little in the south, including Riverina's south. The Riverina was a district of stark contrast, with water across roads in the north and little more than dusty drops on windscreens further south. Southern towns closer to the Murrumbidgee and Murray Rivers, including Barham, Deniliquin, Mathoura and Tocumwal, all received less than half a millimetre, not even enough to clean your car windscreen. Even in parts of the district's north, there has only been a few millimetres worth. Griffith has had less than five millimetres so far and their chances of further rain are diminishing by the hour. Only about 100 km to the north, Hillston accumulated about 70mm, more than double its monthly average and its heaviest rainfall in 12 years. Image: Recorded rainfall in millimetres in the 24 hours to about 9am Saturday 4 May 2024 and satellite and radar images at the time. The pool of cold air helping deliver this rain is continuing to move east, taking rain with it and causing the Riverina to gradually dry out. The district is likely to be rain-free but sunrise tomorrow. The next best chance of rain for the area is in about a week but the system bringing this rain will favour the north again. Moisture should flow from the north and east to feed another pool of cold air and low pressure trough. Keep up to date with the outlook by checking https://www.weatherzone.com.au/nsw and https://www.weatherzone.com.au/models/charts Despite a fair amount of uncertainty regarding how much will fall, those living in the north have some reason to be optimistic about the prospects of follow-up rain despite the increased chance of potholes. Those in the south will need to exercise more patience.
Today, 1:55AM UTC
Spooky spectre sighting west of Sydney
Unlike this weekend, last weekend was calm with light winds and clear skies across NSW, so I knew there would be fog in the valleys near Sydney on the Sunday morning. So I went to the Burragorang Valley to see it full of fog like I wrote about last year River of cloud just west of Sydney. Image: Thick fog covering the Burragorang Valley, west of Sydney. This time I arrived earlier than last time and there was even thicker fog so that I could barely see the other side of the valley. And there was something strange below me as I looked down. A very large shadow with a rainbow-like halo! Image: Mountain spectre and glory projected onto the fog below. The large shadow is called a mountain spectre because it has been commonly seen in mountainous areas in Europe, and the halo is also known as a glory. The phenomenon was caused by the sunlight passing from behind me and interacting with the water droplets of the mist between me and the sun. Image: Sunlight passing through mist behind me. Here is what the scene looked like from the Himawari-9 satellite. Many areas of fog can be seen branching out across the different valleys. The Burragorang Valley is to the west of Camden. Image: Himawari-9 visible satellite image at 8am Sunday 28th April And here is the synoptic chart from that morning, showing the high pressure ridge that led to light winds, clear skies, and cool overnight temperatures. These are the conditions that are favourable for the formation of fog. Image: BOM MSLP analysis at 10am Sunday 28th April
03 May 2024, 3:48AM UTC
Heaviest May rainfall in 82 years recorded in WA town
Parched areas of southwest WA have finally seen some rain this week, with Wandering recording its highest May rainfall in more than 82 years and the most rainfall the town has seen in 13 months. The rain event began on Wednesday, with Bunbury recording a 2-day total of 55 mm to 9am on Friday, May 3, which is the most rain the town has seen since August 2023 and a 3 year high for May. Cowaramup also saw their largest rainfall totals in two and a half years, with 60 mm recorded during the 24 hours to 9am on Thursday, May 2. The rainfall intensified on Thursday as severe thunderstorms and a cold front swept across the region, with some towns recording more than 100 mm of rain in a day in the southwest of the state. Image: 24-hour rainfall to 9am on Friday, May 3. Source: Bureau of Meteorology The largest falls in the 24 hours leading up to 9am on Friday, May 3 were; Brookdale Siding, which saw 120mm Wandering recorded 45.6mm, its wettest May day in more than 24 years, and the most rainfall the site has seen in 13 months. This rainfall is just under a month’s worth of rain. Dwellingup saw 39.4mm Collie East recorded 38mm, a quarter of its monthly average Bunbury observed 35.6mm, its highest May rainfall in three years Karnet hasn’t seen rainfall like this since July 2022, with 35mm falling in the guage. Much of this rain fell in a matter of hours as severe thunderstorms lashed the southwest of the state. The areas that saw the most intense rainfall on Thursday, May 2 were: Brookdale Siding saw 66 mm in the 3 hours to 5:45pm, which has only a 1% chance of occurring in any given year Bunbury recorded more rainfall in an hour than it has in the last 7 months, with 17.6mm falling in the hour leading up to 11am. During the 7 months before May 2024, the site has seen only 15.8mm. Mount William recorded 45.4 mm in the 1 hour to 1:05pm. The video below shows a waterspout off the Mandurah coast in WA on Thursday, May 2. Video: Waterspout and storm clouds off Mandurah coast WA on Thursday, May 2. Credit: tomproudfoot The rainfall that has fallen over the past two days has been very welcome for those in the southwest suffering from the driest 7-month period on record. Image: Rainfall anomalies between 1 October 2023 to 30 April 2024, source Bureau of Meteorology. While this rainfall was not drought-breaking, it has been a great start to May and will go a long way to reducing these rainfall deficiencies in some areas.
Weather in Business
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.
18 Apr 2024, 3:20AM UTC
Generation gone with the wind
A weeklong stretch of low wind power was broken on Wednesday evening, as a weak cold front marched across southern Australia. The chart below shows that the National Electricity Market (NEM) has endured a weeklong stretch of low wind generation, with wind power providing around 6% of the NEM’s electricity, down from last year’s average of 13.1% (Mon, April 15 to Wed, April 17). The daily wind generation has been under 41 GWh/day for the last seven days leading up to Thursday, April 18. The calmest winds occurred on Sunday, April 14 with only 24 GWh/day produced or 4.6% of grid demand. To put this in perspective, the average daily wind generation during the last year up to Wednesday, April 17, 2024, was 71 GWh/day, according to data from the open NEM. This prolonged period of low wind was caused by blocking high pressure systems sitting over southern Australia, forcing cold fronts or strong wind further south. The image below shows the Mean Sea Level Pressure chart on the calmest day, Sunday, April 14, with high pressure stubbornly sitting over the southern half of the country. Image: Mean Sea Level Pressure Analysis at 4am AEST on Sunday, April 14. Source: Bureau of Meteorology. As we mentioned earlier today, a positive Southern Annular Mode (SAM) has led to consistent high pressure systems positioned over latitudes well south of Australia during the first three months of the year and during this week. This has kept cold fronts south of the mainland, and even south of Tasmania. READ MORE: WHAT IS THE SAM? The period of light winds ended abruptly on Wednesday evening, with WattClarity reporting that wind production peaking above 3,000 MW at 9:10pm AEST. The increased wind power on Wednesday night, was caused by a couple of factors; A weak cold front swept across the southeast on Wednesday, bringing stronger winds. A very shallow temperature inversion formed in the early evening protecting the surface from the stronger winds, but the wind turbine hub-height (150 metres above the ground) winds remained strong at around 28-38 km/h in SA. Temperature inversions form at night when the ground cools quicker than the air above it, meaning that the temperature increases with height for a thin layer of the atmosphere. During autumn, the temperature inversions are commonly shallow meaning that while the wind could be weak at the surface, the hub heights could continue to experience strong winds. A similar phenomenon could happen again tonight across southern Australia, with another cold front passing across the south. Looking ahead, light winds are expected to continue from Friday as a stubborn high-pressure system builds over the Bight until early to mid-next week.
