USA Extreme Heat Warning

USA Extreme Heat Warning

In USA More than 165 million people in the United States were under some form of heat advisory or USA warning as soaring temperatures are expected for much of the USA East Coast, South, and Midwest starting Monday and lasting until the middle of this week.

A tracker run by the federal government shows that roughly USA 168 million people are under USA heat alerts across the United States as of Monday afternoon.

“Extreme heat warnings” were issued for sections of USA Iowa, Nebraska, South Dakota, Missouri, Kansas, Tennessee, Illinois, Arkansas, Mississippi, Louisiana, North and South Carolina, Georgia, Florida, Ohio, West Virginia, and Kentucky.

Cities under those warnings include St. Louis, Missouri; Memphis, Tennessee; Raleigh, North Carolina; Sioux Falls, South Dakota; and Des Moines, Iowa, among others.

Various heat watches and advisories were issued across most of the East Coast and Midwest, including cities like New York City, Detroit, Milwaukee, Chicago, Boston, Pittsburgh, Cleveland, and Philadelphia, according to the map, which is updated by the USA National Weather Service (NWS).

In a forecast update on Monday, the USA NWS said that “extreme heat is expected to continue across much of the Southeast and this week, with the most dangerous combination of high temperatures and humidity occurring through Wednesday.”

Heat levels could be dangerous to USA people without proper hydration or cooling, it said, as some areas will see “heat index” values surpassing 110 degrees to 115 degrees Fahrenheit due to the humidity.

“Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors,” the weather service said in an advisory over the weekend. “Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. Stay cool, stay hydrated, stay informed.”

Health officials have said that people at the most risk of heat stroke or heat exhaustion include infants, USA younger children, USA older adults, people with USA mental health problems, pregnant women, and those with chronic medical conditions such as heart disease, obesity, and poor blood circulation.

Symptoms of heat stroke include a body temperature of 103 degrees or higher; red, hot, dry, or damp skin; a rapid and strong pulse; nausea, confusion; dizziness; headache; or a loss of consciousness, according to the U.S. Centers for Disease Control and Prevention and other health agencies.

People suffering from heat stroke should receive immediate USA medical attention, and USA 911 should be called, officials say.

Also USA Monday, the NWS warned that USA thunderstorms in South Dakota may develop into a derecho, or a straight-line wind storm that can cause damage, by Monday evening. The storm system is expected to hit parts of southern Minnesota and USA northern Iowa, while wind gusts are expected to exceed 75 mph in some cases, the agency advised.

Several tornadoes and hail are also possible during the derecho, according to the NWS. Heavy rains over parts of the northern Plains states and upper Midwest region could also trigger flash flooding, it added.

A prolonged and dangerous heatwave will intensify across a swathe of the US this week, ushering in scorching daytime heat, high humidity and stifling overnight temperatures, forecasters predict.

Some 120 million people nationwide are under an extreme heat warning as of USA Tuesday, as Americans head into the Fourth of July holiday weekend, the National Weather Service (NWS) said.

To the north, much of Canada began experiencing its own heatwave on Tuesday, with temperatures up to 37C (99F) expected in Ontario.

It comes after Europe's unprecedented early summer heatwave scorched several countries over recent days, with temperature records broken across the continent.

The heatwave is forecast to hit a large area of the country, from the US east coast to USA central areas of the country. Starting on Thursday, about 250 million people will be exposed to some dangerous level of heat, according to USA weather forecasters.The extreme USA temperatures caused by a heat dome, will peak in the Midwest and Mississippi Valley by Thursday, the NWS predicted.It will shift east into the Ohio Valley and USA East Coast on Thursday and into the holiday weekend, according to the weather service.Temperatures ranging from 95F-105F USA combined with high humidity will bring the heat index to 100F-115F.Daily temperature records are expected to be broken on Thursday and Friday, with some monthly and all-time records possible.

USA Officials are warning people living in the affected areas to limit time outdoors, stay hydrated and ensure access to air conditioning or cooling centres.USA New York City Mayor Zohran Mamdani activated a heat emergency plan with hundreds of cooling USA centres set to open across the city on Wednesday.Detroit, Michigan, where temperatures could reach 100F, opened a dozen recreation centres with air conditioning for residents to cool down.

With the intense weather, some World Cup matches could have heat indexes exceeding the threshold where global players' union Fifpro considers conditions to be too unsafe for play.

The hottest weather will be in Texas, which will mostly hit fans travelling to and from the air-conditioned stadiums in Houston and Arlington.This may also be the case for the England v DR Congo match on Wednesday in Atlanta, Georgia.In Canada, temperatures were expected to remain high until Thursday, particularly in the province of Ontario, where it could hit 37C (99F) this week.Amid the heat, Toronto is due to host a World Cup game on Thursday - when temperatures are predicted to reach 35C (95F).The country has issued orange heat warnings - the second level of a three-tier alert system - in Ontario.

Meanwhile, central and eastern parts of Ontario, including Montreal, are also predicted to see high temperatures. Yellow heat warnings, the lowest level, are in place.

• Extreme Heat Warning—Take Action! An Extreme Heat Warning is issued when extremely dangerous heat conditions are expected or occurring.  Avoid outdoor activities, especially during the heat of the day. If you must be outside, be sure to drink plenty of water and take frequent breaks in the shade. Stay indoors in an air-conditioned space as much as possible, including overnight. Check on family and neighbors. 
• Extreme Heat Watch—Be Prepared! An Extreme Heat Watch is issued when conditions are favorable for an extreme heat event but its occurrence and timing is still uncertain. Plan to suspend all major outdoor activities if a warning is issued. If you do not have air conditioning, locate the nearest cooling shelter or discuss staying with nearby family or friends who have air conditioning.
• Heat Advisory—Take Action! A Heat Advisory is issued for dangerous heat conditions that are not expected to reach warning criteria. Consider postponing or rescheduling outdoor activities, especially during the heat of the day. If you must be outside, be sure to drink plenty of water and take frequent breaks in the shade. Stay in a cool place, especially during the heat of the day and evening.

Officials Urge Caution Amid Heat Wave Over Holiday Weekend. Dangerous heat is expected across much of the United States through the Fourth of July weekend. Mayor Zohran Mamdani of New York City urged people to take the forecast seriously.CreditCredit...Madison Swart for The New York TimesA significant heat wave that has broiled much of the Midwest this week is spreading farther east on Wednesday, bringing the potential for record-breaking high temperatures to millions more people. Little relief is expected for much of the country until the weekend.

More than 160 million people are under extreme heat warnings or heat advisories, and for many it was the second or third straight day of severe warnings to avoid being outside in the warmest parts of the day.

Triple-digit temperatures are being made worse by high levels of humidity, leading to oppressive heat index readings. Many emergency officials and meteorologists say the heat index is a more accurate measure of what it feels like outside than temperature alone.

And on Tuesday, the heat index was brutal: 106 in Chicago; 113 just north of Milwaukee; 103 in Cleveland; 113 in southern Illinois. On Wednesday, the Weather Service said, cities from Kansas City to Boston will likely record heat index values between 100 and 115 degrees.

Radley Horton, a professor at Columbia University’s Climate School, said this particular heat wave has been characterized by especially high humidity.

“And when the amount of moisture in the air is particularly high, it tends to make nights that much warmer,” Dr. Horton said. “Temperatures don’t change as much between daytime and nighttime.”

Multiday warnings of extreme heat landed in New York, Boston and Philadelphia on Wednesday as sultry weather pushed east just ahead of Fourth of July celebrations in a region that revels in its role as a historic hub of U.S. independence.Temperatures in the high 90s Fahrenheit (30 degrees Celsius) were forecast for the Northeast; Philadelphia and Boston could top 100 by Thursday. Throw in humidity, and the real-feel heat index will be even higher at times, the National Weather Service said.

A heat dome — high-pressure systems above a region that trap heat and humidity — has been smothering parts of the U.S., from the Midwest to the East Coast. It will add much discomfort amid 250th anniversary parades, ship flotillas, outdoor concerts and, in Boston, a popular public reading of the Declaration of Independence from a historic balcony Saturday.

USA New York Mayor Zohran Mamdani advised residents to stay cool inside and avoid “extraordinary temperatures.”

“To be breaking into triple digits over the course of these many next days — it is of immense concern given that too often the heat is something that is underestimated,” Mamdani said.

In Hamptonburgh, New York, air conditioning failed on a bus carrying Junior ROTC cadets, resulting in multiple heat-related illnesses, Orange County authorities said. Some cadets were taken to hospitals as a precaution.

Concrete and steel aggravate hot weather

USA Humidity is not uncommon in the Northeast. But Dr. Alexander Azan of NYU Langone Health in New York said high air temperatures and humidity are a dangerous combination.“Their body doesn’t have that level of acclimatization to respond appropriately to the heat, and so heat stress in the form of what we call heat exhaustion, and in more severe cases, heat stroke, can occur at much lower temperatures than we see in people who live in the South,” Azan said.

“The USA concentration of concrete, asphalt, steel, all of those materials help to retain heat,” said Vijay Limaye, a climate scientist at the Natural Resources Defense Council. “The number on your phone may actually not reflect the true temperature profile that you’re going out into.”USA New York City said more than 200 teams of government workers and volunteers will check on homeless people and encourage them to get inside. There will be hundreds of cooling centers, from the Javits Center convention hall to vans to outdoor spots with misting fans.

Cashing in on the USA weather

The phone seemed like it wouldn't stop ringing at Acme Ice Co. in Cambridge, Massachusetts, which delivers ice to bars and restaurants in the Boston area. The owner, Marc Savenor, said this week's stretch of hot weather is an “ice man's dream.”

“What could an ice man ask for? ... I’ve hired a couple extra drivers. I’ve put on an extra couple trucks. I put ice in different freezers so I don’t run out,” Savenor said. “After my ice is depleted here, we go pick up another load, bring it back, and we deliver it everywhere.”

The American Kennel Club’s Museum of the Dog in New York is allowing visitors to bring their dogs to cool off, through Sunday. Executive Director Christopher Bromson said he got the idea from seeing his own Newfoundland sprawled on the museum’s cool floor.

“I thought every dog should have access to this,” he said.

In USA Washington, D.C., where the high temperature was 95 F (35 C), thirsty children reached for cold water from U.S. Park Police as they waited in line for the Ferris wheel on the National Mall.

In the USA Midwest, meanwhile, heat risks remained. Taylor Harnist, whose Cincinnati business installs and repairs air conditioners, said he was trying to keep his employees comfortable with breaks, water and electrolyte drinks.

“You get an attic job when it’s this hot, we do them but it’s strenuous,” Harnist said. “It’s so hot the attics will reach temperatures of 145 degrees.”

Posted on 2026/07/02 09:12 AM