Thanks to a stalled high-pressure system, known as a 'blocking high', rain — and potentially flooding — could be on the cards for New South Wales.
Rain could fall for 10 days straight along the New South Wales coast as weather systems over southern Australia grind to a standstill.
While some blocks lead to warm and sunny weather, this week's pattern will bring cool and showery weather to the NSW coast, intensifying into areas of heavy rain this weekend which may even culminate in another bout of flooding.The seemingly jammed-up weather map is due to the unusual behaviour of the jet streams, fast-moving ribbons of air around 10 kilometres above the Earth's surface.
During the cooler months the polar jet often migrates far enough north to connect with the subtropical jet, however this week, the two jet streams have split to the west of Western Australia – the subtropical jet has shifted slightly north to around 25 degrees latitude, cutting right through the centre of Australia, while the polar jet has dived well south to the Antarctic coastline.
Winds blow anti-clockwise around high-pressure systems and its location below the Bight will ensure south to south-easterly winds prevail across south-east Australia – onshore and showery for eastern NSW, and cross-shore or offshore for most other coastlines. Sydney's heaviest rain is likely from Saturday to Monday, and it would be no surprise if the city's weekly total exceeded 100mm and even passed the May average of 117mm by this time next week.
Under the coastal low set-up, which some models are hinting at, warmer and moister air will wrap into the system from the north, leading to hundreds of millimetres of rain and possibly major flooding — but thankfully this worst-case scenario is currently only an outside chance.US website defends hosting Australian 'whites-only' community fundraiser on website
Rain Sydney NSW Warnings Tom Saunders Meteorologist Stalling Weather Blocking High Floods
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