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The northern polar jet stream (it has a counterpart in the Southern Hemisphere) is driven partly by the temperature contrast between masses of icy air over the North Pole and warmer air near the equator. Climate change, true to the predictions of the past half century, has led to faster warming in the Arctic than in the temperate zones. So the temperature difference between the two regions has been lessening.
Research suggests that this reduction in the temperature difference is robbing the jet stream of some of its strength, making it wobblier and contributing to more temperature extremes.
What's the jet stream's role in extreme weather?
The jet stream is strongest in winter, when it has the greatest effect on weather in more densely populated parts of North America and Eurasia.
When it rolls along in relatively steady waves, normal weather ensues, with spells of cold, snow and intermittent warm-ups.
But when it coils far to the south, bitter cold Arctic air spills southward along with it.
apan's weather agency has declared a heatwave sweeping the country a natural disaster, with at least 65 deaths recorded in the past week. An agency spokesman warned that "unprecedented levels of heat" were being seen in some areas. More than 22,000 people have been taken to hospital with heat stroke, nearly half of them elderly, officials say. On Monday, the city of Kumagaya reported a temperature of 41.1C (106F), the highest ever recorded in Japan. The heatwave shows no sign of abating, forecasters say. In central Tokyo, temperatures over 40C were also registered for the first time.
Greece is in the grip of deadly wildfires as soaring temperatures continue across much of Europe In Sweden at least one person has been killed and dozens more injured by forest fires. Hot weather and persistent drought have seen wildfires raging as far north as the Arctic Circle Neighbouring Norway experienced its hottest May temperatures on record and has also suffered forest fires Parts of the UK are also experiencing a prolonged heatwave and the government has issued a "heat-health watch" alert in the east and south-east of England Cities across eastern Canada suffered a deadly heatwave in early July , with at least 70 deaths in Quebec province alone A heatwave in Southern California saw record-breaking temperatures in some areas including a sweltering 48.9C (120F) in Chino, outside Los Angeles Reports from Algeria say that Africa's hottest ever recorded temperature was registered in the northern city of Ouargla on 5 July - 51.3C (124.3F)
Looks like the southern hemispehere is warmer than usual too then
Reality Check: Mapping the global heatwave
originally posted by: TruthxIsxInxThexMist
a reply to: johnb
There has been a few fires in England this year... very unusual. In fact, I havn't heardof it happening here before, there was one started last Wednesday night in Wanstead Park which isclose to Epping Forest. Surprised it didn't start in Epping Forest instead. We have higher temps coming this week so maybe one will start there.. But it could also have ben caused by someone throwing a cigarette away and then the heat just caused a little spark to light the dry grass.
The UK's longest heatwave since 1976 is forecast to intensify as the week goes on, with 91F (33C) temperatures expected today and 93F (34C) tomorrow before the South East of England faces a sizzling 97F (36C) on Friday. But torrential downpours are forecast to hit northern and eastern England on Friday afternoon and evening, bringing up to 2.4in (60mm) of rain in just three hours along with thunderstorms, large hail and gusty winds. Temperatures will then drop a little to 77F (25C) by the weekend which will provide some relief for a country that is today entering its 31st consecutive day that has brought a UK maximum reading of at least 78F (26C).