25 July, 2021
On above image, the Jet Stream can be seen forming Omega patterns on the Northern Hemisphere, going circular over the Arctic Ocean and crossing the Equator.
Why does the Jet Stream get distorted?
The Arctic gets hit much harder by temperature rises. This causes the difference in temperature to narrow between the North Pole and the Equator.
This in turn slows down the speed at which wind travels from the Tropics to the North Pole.
This in turn makes the Jet Stream more wavy, just like a slow-moving river over flat land will take a winding route and meander.
|Polar Jet Stream and Subtropical Jet Stream – NOAA image|
On the Northern Hemisphere, the coldest point used to be the North Pole, so wind used to flow from the tropics to the North Pole.
This resulted in two Jet Streams forming, circum-navigating the globe in relatively narrow and straight bands, i.e. the Polar Jet Stream at 60°N and the Subtropical Jet Stream at about 30°N.
|Polar Jet Stream (blue) and Subtropical
Jet Stream (red) – NOAA image
For many years, Jennifer Francis et al. has been warning that this will cause more extreme weather in mid latitudes.
As a result of this distortion of the Jet Stream, extreme weather events are striking with ever greater frequency and intensity. The Northern Hemisphere has been hit by stronger heatwaves, forest fires, storms and flooding.
• Heatwaves and the danger of the Arctic Ocean heating up
• More Extreme Weather
• Opening the Doorways to Doom (2012)
• Polar jet stream appears hugely deformed (2012)
• Linking Weird Weather to Rapid Warming of the Arctic – by Jennifer Francis (2012)
• Climate Plan