Significant changes in the northern jet stream has caused serious problems for Europe and South Asia:
Unusual jet stream behavior has been recorded every three to five years since 2000 — in 2003, 2006, 2010, 2015 and 2018 — turning what scientists initially thought could be an isolated abnormality into what appears to be a pattern, [Jeff Masters, co-founder and director of meteorology for Weather Underground] said.
What is surprising to scientists now is that the wavier-than-normal jet stream has returned for a second year in a row — the first time that has been observed, said Kai Kornhuber, a climate scientist at The Earth Institute at Columbia University in New York City.
“I wouldn’t have expected this situation to return so quickly after the extreme summer last year,” Kornhuber said. “It gives me the chills to see this evolving in real time again. It’s a really worrying development.”
This weather pattern brought temperatures over 45°C to France earlier this week:
The highest reliable June temperature previously recorded in France was 41.5°C on 21 June 2003. The country’s highest ever temperature, recorded at two separate locations in southern France on 12 August during the same 2003 heatwave, was 44.1°C.
“At our local Potsdam station, operating since 1893, we’re set to break the past June record by about 2C,” tweeted Stefan Rahmstorf, of the Potsdam Institute for Climate Impact Research. Eastern parts of Germany, including Berlin, are already experiencing their hottest June on record.
“Weather data show that heatwaves and other weather extremes are on the rise in recent decades,” he said. “The hottest summers in Europe since the year AD1500 all occurred since the turn of the last century: 2018, 2010, 2003, 2016, 2002.”
Monthly records were now falling five times as often as they would in a stable climate, Rahmstorf said, adding this was “a consequence of global warming caused by the increasing greenhouse gases from burning coal, oil and gas”.
And the band played on...