Dangerous Heatwave Moving Into Eastern US
Your Daily Update for June 29, 2026. Plus: A dangerous heatwave is moving into the eastern United States, packing high temperatures and humidity.
Welcome to today’s daily update for Monday, June 29, 2026. Here’s everything you need to know.
The Breakdown
Devastating heat is set to move into the eastern United States due to a growing heat dome, bringing scorching temperatures and unrelenting heat. The sudden temperature change has been caused by a shift in the jet stream, a fast-flowing air current high above the ground. When this stream of air changes direction, it heavily influences temperatures around it – traditionally, areas above the jet stream experience cooler temperatures, while areas below the jet stream experience the opposite.
Last week, the air current fell into a severe dip in the western US, delivering below-average temperatures and cool weather. However, this corresponds with a sharp rise in the jet stream over the central US, bringing high-pressure and extreme heat to much of the eastern portion of the nation later this week.
Humid air will also be rising from the Gulf of Mexico, bringing thick, muggy conditions into much of the South and the Midwest. This, combined with the already-searing heat, will send heat indices well past 100°F (38°C) across much of the region.
A heat index, also known as the “feels-like” temperature, is a value calculated by taking the actual air temperature and factoring in relative humidity. This provides a more accurate representation of how hot it would actually feel to a human – higher humidity levels reduce sweat evaporation and make the body feel hotter.
These are the highest expected temperatures across the next week in various major cities, according to NOAA, with actual temperatures shown first and heat indices shown second.
Memphis, Tennessee
Saturday, July 4 will reach 95°F (35°C), with a feels-like of 111°F (44°C).
New Orleans, Louisiana
Saturday, July 4 will reach 90°F (32°C), with a feels-like of 111°F (44°C).
St. Louis, Missouri
Thursday, July 2 will reach 97°F (36°C), with a feels-like of 110°F (43°C).
Dallas, Texas
Sunday, July 5 will reach 101°F (38°C), with a feels-like of 107°F (42°C).
Houston, Texas
Sunday, July 5 will reach 95°F (35°C), with a feels-like of 107°F (42°C).
Atlanta, Georgia
Friday, July 3 will reach 95°F (35°C), with a feels-like of 105°F (41°C).
Tampa, Florida
Wednesday, July 1 will reach 91°F (33°C), with a feels-like of 106°F (41°C).
Charlotte, North Carolina
Saturday, July 4 will reach 100°F (38°C), with a feels-like of 104°F (40°C).
Washington D.C.
Saturday, July 4 will reach 102°F (39°C), with a feels-like of 105°F (41°C).
Chicago, Illinois
Thursday, July 2 will reach 95°F (35°C), with a feels-like of 104°F (40°C).
Detroit, Michigan
Thursday, July 2 will reach 97°F (36°C), with a feels-like of 107°F (42°C).
Worries are also growing that the extreme heat, particularly in Washington D.C., could impede the Trump administration’s plans for a “spectacular” celebration of the nation’s 250th anniversary on July 4.
Unfortunately, extreme heat events like this will just continue to become more common as climate change intensifies – we have already seen how serious the situation can be in western Europe, a region without air conditioning, and various countries and regions across the globe are beginning to see such heatwaves on a regular basis.
The Global Snapshot
France has confirmed over 1,000 deaths due to the latest heatwave to hit Europe. The heat dome has since moved east, bringing searing temperatures to central Europe, but the western portion of the continent is just beginning to recover from the devastating heat.
Also headlining French news was a crash in the northeastern corner of the country – a skydiving plane crashed near the town of Nancy, killing all 10 parachutists and the pilot onboard. Investigations into the cause of the crash are currently underway.
Meanwhile, another devastating crash occurred in Saudi Arabia yesterday. At least 14 Saudi nationals were killed in the crash of an Aramco helicopter near the Gulf port of Ras Tanura.
Fact of the Day (The Fact Site): While most people think of Neil Patrick Harris as an actor, he is also a writer, producer, comedian, singer, and even an amateur magician.
Quote of the Day (Gracious Quotes): People have only as much liberty as they have the intelligence to want and the courage to take. (Emma Goldman)
Word of the Day (Merriam-Webster): Gainsay (verb, gayn-SAY) - To gainsay something is to deny or disagree with it, or to show or say that it is not true. Gainsay is a formal word usually used in negative statements.
In a Sentence: Although the defendant initially denied involvement in the incident, there was no gainsaying the evidence that the prosecutor presented at the trial.
Image is licensed under CC0 1.0