Monday, January 30, 2023

Video: United States on maximum alert for tornadoes and heavy flooding

National Weather Service (NWS)) they reported The Southern United States is on alert for a major winter storm and the threat of powerful tornadoes and flooding this Wednesday.whereas in the Midwest, you could Produces heavy snow and torrential rain.

nws The storm will bring heavy snowfall, snow accumulation, as well as lightning from this Wednesday through early next week.

It should be noted that the winter storm will move from the Central Plains into the Midwest on Wednesday, weakening Great Lakes on Thursday, January 5.

On the other hand, additional storms in the Pacific could affect the west with heavy snowfall and rain that poses a risk of flooding in low-lying areas.

The alert applies to more than 35 million people in the area near the Gulf of Mexico coast, in southeastern Louisiana and southern Mississippi and Alabama, which is on alert for severe weather at level 3 (out of 5), while Nashville, New Orleans and Atlanta are on alert 2.

What is the connection between winter storms and global warming?

The world is getting warmer including winters. Although, America It has experienced severe winter storms in recent years, and experts are looking closely at the link between these bouts of extreme cold and climate change.

Unlike the relationship between global warming and heat waves, which is more direct, the behavior of winter storms is governed by complex atmospheric dynamics that are more difficult to study.

Still, “there are some aspects of winter storms … where the links to climate change are quite clear,” he pointed out. AFP Michael Mann, climatologist University of Pennsylvania.

For example, the warming of water bodies, such as lakes or oceans, affects the amount of snow that falls.

in america, Las lake effect snow" occurs around the area of ​​lthe great Lakeson the border with Canada. buffalo townwhich is situated on the banks of a the great Lakeswas hit hard by deadly snow over the weekend of Christmas.

Cold air from the north collides with the warm water of these lakes and causes convection, which leads to snowfall.

“The warmer the lake temperature, the more moisture (there is) in the air and the greater the likelihood of lake-effect snowfall,” Mann wrote in a 2018 article.

“As expected, we see a long-term increase in lake-effect snowfall as temperatures have increased over the last century,” he explained.

polar vortex in progress

However, there is no consensus on other mechanisms, such as Effects of Climate Change on the Polar VortexRay jet air currents.

The polar vortex is an air mass above the North Pole, located high in the stratosphere. AleHumans reside in the troposphere, and the stratosphere is located just above it.

This vortex is surrounded by rotating bands of air, which act as a barrier between cold air from the north and warm air from the south. As the polar vortex weakens, this band of air begins to ripple and becomes more oval in shape, bringing more cold air to the south.

According to a 2021 study, this type of disturbance occurs more frequently, and when it does, it echoes further down in the atmosphere, where the jet stream is located, for the next two weeks.

This air current, which moves from west to east, again follows the boundary between cold and warm air, then dissipates as cold air from the north descends at lower latitudes, especially in the eastern United States.

“Everyone agrees that when the polar vortex is disturbed, the likelihood of severe winter weather increases,” Judah Cohen, the study’s lead author and a climatologist at the Center for Atmospheric and Environmental Research (AER) Analysis, told AFP. Is.”

And this “extended” polar vortex is exactly what was seen just before the storm hit the United States this December, he said.

The same phenomenon was seen in February 2021, when a severe cold snap hit Texas, causing widespread power outages.

With information from AFP.

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Nation World News Desk
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