Heat advisory in effect as heat dome expected to raise temps to triple digits in US, 90 million Americans at risk

The National Weather Service (NWS) has sent out alerts for extreme heat warnings, watches and advisories to millions of people across the South and parts of the Midwest in the US. Heat alerts from the NWS spanned parts of US states with a heat dome expected to cover swaths of the US this week.

A "heat dome" is expected to increase temperatures and humidity levels in those areas through the rest of the week. The hot, humid air is likely to stretch into the Northeast by Thursday.

An “Extreme Heat Watch” advisory alert, which warns “dangerous heat is possible,” was issued for Illinois, Louisiana, Wisconsin and Iowa on Monday and is expected to be in effect through Thursday. An “Extreme Heat Warning” alert, which warns “dangerous heat is happening or about to happen,” was sent to areas in Missouri, Kentucky, Arkansas, Oklahoma and Tennessee on Monday; Mississippi residents got one Tuesday morning.


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Here are ten points you need to know about heat advisory in US:

-AccuWeather says almost 200 million people will experience the triple digit "RealFeel" temperatures on July 25 alone. The "extreme heat warnings" will sweep across large parts of the US, affecting more than 70 million Americans.

-The NWS issued extreme heat warnings when "extremely dangerous heat conditions are expected or occurring. Extreme heat warnings are in effect for parts of Arkansas, Missouri, Illinois, Kentucky, Tennessee, Mississippi, and Louisiana.

-"Dangerously hot conditions," with heat index values—which reflect how hot it feels when temperature and humidity are considered—nearing or surpassing 110 degrees would be possible in these areas, the weather department said.

-Less severe heat advisories spanned parts of South Dakota, Nebraska, Kansas, Oklahoma, Texas, Indiana, Alabama, Florida, Georgia, South Carolina, and Michigan. In these areas, the heat index values were also expected to hit the triple-digit range.

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-AccuWeather meteorologist Kai Kerkow told Newsweek: "A heat dome will bring near record breaking hot conditions across the South Central U.S. this week, with cities like Wichita Falls, Dallas, and Kansas City expected to hit 100 degrees Fahrenheit for the first time this season.

-Kerkow added that temperatures in cities such as New York, Philadelphia, and Washington, D.C., are expected to climb into the mid-90s. On Friday, AccuWeather predicts a high of 95 in New York, nearing the 97 degree record set in 1999, Kerkow said.

-"Over 90 million people are under heat alerts currently (Extreme Heat Warnings, Watches, and Heat Advisories). The heat is expected to persist the longest over the Mid-MS Valley and Mid-South regions this week," NWS Weather Prediction Centre said on X, formerly known as Twitter.

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-Prolonged extreme heat, as is expected in the heat dome this week, is especially dangerous for people who do not have access to air-conditioning or who spend a lot of time outdoors. If you live in a place impacted by the heat dome, stay indoors and cool for as long as you can.

-Understand and look out for symptoms of heat-related illness. These include heavy sweating, fatigue, dizziness, muscle cramps, nausea and headaches. If you are experiencing these symptoms, move to a cool area to rest and hydrate.

-"Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors," the alerts caution. "Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes."