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Prevent US forecasters this week by the most intense "cold wave" of recent decades.
These extreme conditions, caused by a rotating mbad of ice called a polar vortex, can cause a temperature of -53 ° C.
It is expected that tens of millions of people experience temperatures below zero.
The states of Wisconsin, Michigan, and Illinois in the Midwest, as well as those of Alabama and Mississippi in the south, generally warmer, have declared the state of 39; emergency.
Authorities in the state of Iowa asked the people "to avoid deep breathing and minimize conversations" in the street.
Forecasters predict that in Chicago, Illinois, the cold will be more vivid than Everest and Antarctica.
According to the authorities, the city could experience a minimum temperature of -32 ° C, with icy winds that would give a thermal sensation of -45 ° C.
"I would say that the intensity of this air cold is unique in recent decades, "said John Gagan, a specialist in the National Weather Service (NWS).
The NWS warns that it is possible for a person to freeze in less than 10 minutes if she goes outside in such extreme circumstances.
The coldest temperatures should be recorded between Tuesday and Thursday.
The President of the United States, Donald Trump, challenges the existence of a climate change and took advantage Monday of the polar wave to return to this point.
"In the magnificent Midwest, wind temperatures reach -60 ° C, the highest cold ever recorded.In the coming days, it should be even colder for a few minutes.What happens with global warming? Thanks again for coming back soon, we need you! "
In the beautiful Midwest, wind chill temperatures reach minus 60 degrees, the coldest ever recorded. In the coming days, we expect it to get even colder. People can not last even a few minutes. What's going on with Global Waming? Come back soon, we need you!
However, the National Oceanic and Atmospheric Administration (NOAA) government issued what was widely interpreted as a rebuttal of what Trump had said.
"Winter storms do not prove that global warming is not happening," tweeted the agency on Tuesday.
Meteorologists attribute this cold current to a sudden warming of the North Pole caused by a blast of warm air from Morocco in December.
This climate system has divided the polar vortex and brought it to the south, said Judah Cohen, winter storm specialist at Environmental Atmospheric Research.
"The fact that the cold air from the Arctic is heading towards the United States does not mean that the planet is warming as a whole," said Derek Arndt of the BBC's Spanish World Service at the BBC News World. NOAA in North Carolina.
The Polar Vortex, incidentally, "is a local event and the US Midwest occupies a very small part of the planet," he added.
"As we live this cold season in parts of the United States and Canada, the rest of the world is hot and we find that on average, the planet continues to heat up," Arndt said. .
The world's leading scientists say climate change is mostly man-made and can lead to harsher winters.
What was the impact of this cold season?
In the United States, temperatures can drop less than 50 degrees – Photo: Pixabay
1,100 flights to and from the United States were canceled Tuesday, including in Atlanta, in Georgia, where will be held on Sunday the Super Bowl football championship, considered one of the biggest sporting events in the world. 19659027] In the Midwest, thousands of schools and businesses were closed, as well as various government agencies.
Dozens of homes were opened in American cities to accommodate the population.
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