Friday 29th of November 2024
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the deluge...

jetstreamjetstream

Here's the latest shot at 11 am, 08/03/2022, of the Jet Stream over Australia.

You don't have to be an expert to know it's pathetic. We cannot speculate really if the pissy Jet Stream of the last few days is the cause or is the effect of the silly weather we are having here in Sydney. My guess would be that because the Jet Stream is so weak, it cannot push away the "normal" alternate of high and low pressure system over the continent, usually changing the system every three days.

 

So why is the Jet Stream so weak? The La Niña is responsible we would suggest. But I guess the ocean and air temperatures are quite higher than during previous La Niña events... This should hold off the dew point, but the atmosphere is holding far more moisture than before, due to global warming — and the water has nowhere to go but down in buckets, in cats and dogs or as the French would say: like pissing cows... The Germans say: Das Hundewetter. 

 

Looking at the evolving Jet Stream, the moist air mass was dragged back once more over the coast by the weakling JS, overnight...

 

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Thousands of people in Sydney's south-west have been ordered to leave their homes as the Georges River sparks flooding in the area.

An east coast low is causing significant rainfall over Greater Sydney and its surrounds, and authorities have warned it is expected to continue for an extended period.

Follow the latest updates.

Read more:

https://www.abc.net.au/news/2022-03-08/sydney-rain-blog-flooding-sparks-evacuation-orders/100890524

 

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yesterday's deluge

JS.JS.

Yesterday's Jet Stream about the same time as the one above (today)...

 

Read from top.

 

 

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jet streams on 9 march 2022...

JS 90322JS 90322

 

Draw your own conclusions...

 

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jet streams…...

You wouldn’t know it from the torrential rains that have inundated large parts of New South Wales and Queensland this year, but average late-autumn rainfall over southeast Australia has declined significantly since the 1990s. 

Less rain in these areas is an expected consequence of global warming. In both the northern and southern hemispheres, the paths of the weather systems that bring rain in the middle latitudes have been moving away from the equator and towards the poles. 

Read more: Australia's dry June is a sign of what's to come

We studied in detail the drop in rainfall during April and May in southeast Australia, and found it is just one consequence of far-reaching changes in the behaviour of high-altitude winds over Australia.

 

Jet streams

These high-altitude winds are called jet streams: narrow bands of rapidly flowing air that typically occur at altitudes around the cruising height of commercial passenger aircraft. In April and May, the westerly jet stream over southeast Australia normally splits into a northern branch (called the subtropical jet) and a southern branch (called the polar-front jet).

 

READ MORE:

https://theconversation.com/changes-in-the-jet-stream-are-steering-autumn-rain-away-from-southeast-australia-184649?utm_medium=email&utm_campaign=Latest

 

 

READ FROM TOP: We've been on the case for a while......

 

 

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