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Saturday, July 2, 2022

Over 125 million people under heat alert in US

by Judson Jones | CNN

It is exceptionally hot and humid at any time of the year.


“We don’t change our criteria based on the time of year,” Matt Beitcher, a National Weather Service meteorologist in St. Louis, told CNN’s Weather.

A heat dome that began last week in the southwest has shifted to Central America, where heat and humidity will simultaneously climb to levels that will significantly affect the human body.

“This is a day where not only people who are most susceptible to heat-related illnesses, but really just about anyone who is going to be outside for long periods of time, is at risk for heat-related illnesses,” Beitcher said. Told.

More than 125 million people are in heat alert Monday evening across much of the central and eastern states, including extreme heat warnings and heat advisories. This is more than a third of the US population. Cities with extreme heat warnings include Tulsa, Memphis, St. Louis, Minneapolis, Cincinnati, Raleigh and Charlotte.

“Record-breaking heat is forecast to spread from the Great Plains today through the Mississippi Valley and into the Southeast through midweek, thanks to the expansion of Upper Level Ridge,” the Weather Prediction Center said Monday afternoon.

With daily high temperature records already being set in several cities on Monday afternoon, here are a few:

  • Columbia, South Carolina, reached an afternoon high of 103 degrees, breaking its old June 13 record of 102 degrees in 1958
  • North Platte, Nebraska 1952. I hit 108°, breaking my old record of 103° set.
  • St. Louis, Missouri 1952. Achieved a height of 100° breaking his old record of 98° set in
  • Charlotte, North Carolina, hits 98°, breaking its old record of 97° set in 1958
  • Nashville, Tennessee, hits 97°, breaking the previous record of 97° set in 2016
  • Jackson, Kentucky, hit 94°; Previous record 2000 . in was 91°
  • Asheville, North Carolina, hit 92 degrees; Last record 2016 . in was 91°

The inclement weather in the middle of the country will feel its worst, putting the cities of Memphis and St. Louis under the highest risk category, an “extreme heat warning.”

“It’s unusual to see an extreme heat warning earlier this year,” said Memphis NWS meteorologist Mike Johnson. “We issue extreme heat warnings once or twice a year. This is very rare because it requires a heat index of 110 degrees.”

The Heat Index is a chart that combines humidity and heat to show what the air actually feels like to a human.

Take it from this Southern meteorologist, when it’s so humid, you constantly look like you just walked outside and ran a marathon.

This is because there is already a lot of moisture in the air, and this will keep your sweat from evaporating.

Evaporation is the process that cools your body. So, your body will not cool down when it is humid because there is nowhere for the sweat to go. It makes it feel much hotter than that.

The reason behind the extremely high temperatures is the area of ​​high pressure that forms a clear lid over the US. The lid will trap any escaping radiation and send it back to the ground, while the sun’s rays continue to penetrate.

The severe heatwave is even more dangerous because it is occurring in June, nearing the longest days of the year. The National Weather Service measures temperature in the shade and the heat index is calculated using readings from the shade. In such a situation, the heat will be felt even more in direct sunlight.

It’s going to feel “much, much worse than shade in the sun,” Beatscher said. “These values ​​are like your baseline, and then they get worse from there if you’re talking about the effect of the Sun.”

To add insult to injury, don’t expect it to be hot one day and cold the next.

“It’s going to be a long-term event, and it’s not just going to last tomorrow and today; it’s going to continue throughout the week,” Johnson said.

WPC forecast Tuesday that humid weather will continue to move northeast into the upper Mississippi Valley, the western Great Lakes and the Ohio Valley while continuing to build in the southern mid-Atlantic and Southeast.

“Slight change expected on Wednesday, forecast to see back-to-back record-setting days in many locations,” WPC wrote.

Temperatures in Chicago could also reach near triple digits, allowing the heat index to easily exceed 100 degrees this week.

it’s disappointing to think about

I hate to be the bearer of even more loud news, but heatwaves are something we have to get used to.

“Climate change is increasing the frequency and intensity of heat waves around the world, tilting the scale in the direction of warmer temperatures,” explained CNN meteorologist and climatologist Brandon Miller.

According to the US National Climate Assessment, “In the United States, record high temperatures are now more than twice as likely as record low temperatures.”

“And while much of the country is ripening in the peak summer heat before the summer solstice, Europe and Asia are also experiencing large heat waves simultaneously,” Miller observed.

In Europe, heat is being pumped north around an area of ​​high pressure, as we are doing in the US. It is bringing scorching heat to Spain and France for the rest of the week.

It is likely to peak in France on Thursday and Friday. Spain, where it will last until at least Thursday, is also grappling with a surprising drought. The dryness, coupled with the heat, is putting much of the country at “extreme” fire risk.

It is very similar to what is happening in New Mexico, where the fire threat is once again serious, today and tomorrow.

And then there’s northwest China, where temperatures will reach well into the triple digits Fahrenheit.

a heat dome and a derecho

Another disaster is likely on the northern and northeastern sides of the dome this summer: a derecho could form.

To be called a derecho, severe storms must have winds of more than 58 mph and cause damage extending for at least 250 miles. The resulting conditions can be described as a tropical storm over land. National Oceanic and Atmospheric Administration climatologist Adam Smith described the 2020 Derecho to CNN Weather as an inland storm, with reports of winds of more than 100 mph and hurricane-force winds lasting up to 45 minutes.

“Some of the most intense summer derechos, especially the progressive types, occur at the edge of major heat waves,” the SPC wrote explaining derechos on its website.

They historically occur at the edge of heat domes, as the jet stream moves around high pressure – the level of the atmosphere where jets blow and the strongest wind currents are found – up and around, which helps create instability. does.

But on Monday afternoon, it was still uncertain whether one would form later today.

Even if it doesn’t, thunderstorms in the form of hurricane-force wind gusts (75+ mph) could occur from Wisconsin to Ohio on Monday afternoon and evening.

CNN meteorologist Chad Myers stressed, “There is a risk of severe wind damage quite widespread tonight and throughout the night.” “Expect severe weather watches and multiple warnings starting this afternoon. In fact, this fast-moving group of storms could even reach the mid-Atlantic states by morning.”

World Nation News Desk
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