Extreme summer weather, including excessive heat, will intensify next week in the United States.


Summer technically starts next week and will show the United States what it’s made of in the face of global warming from fossil fuel pollution and no El Niño.

Prolonged, record-breaking heat is on the way in a region of the country that has largely avoided it so far, wildfire risks are increasing in parts of the West, and hot bathtub water could fuel the first Atlantic hurricane tropical depression. season.

The heat arrived in the eastern half of the country on Friday, but that’s just a taste of what’s to come.

An expansive and exceptionally strong thermal dome is built Sunday over the East and spread to reach the Midwest and Great Lakes over the next few days, ushering in the region’s first significant heat wave of the year. Heating domes trap air and bake it under abundant sunlight for days, making each day hotter than the last.

This one will cause temperatures to skyrocket to levels hotter than even the hottest typical summer day.

Hundreds of temperature records could fall by the end of next week, day or night.

Temperatures will reach 15 to 20 degrees above normal across much of the eastern half of the country Monday afternoon, but will rise even further to 25 degrees above normal at times Tuesday through Friday.

That translates to high temperatures well into the 90s for tens of millions of people who typically don’t cook in sustainable heat.

View this interactive content on CNN.com

At night, no relief from the heat will be felt, which is another symptom of a warming world. Overnight low temperatures are not expected to fall below the 70s or above the 60s in many locations.

To make matters worse, humidity will work in tandem with extreme heat to push the heat index — the sensation of heat on the human body — into dangerous triple digits in parts of the East. Heat index values ​​in the low 100s are possible as far north as Maine next week.

Heat-related health risks will reach extreme levels for millions of people next week, according to a scale from the National Weather Service and the CDC. Heat is the deadliest form of weather in the United States, killing on average twice as many people each year as hurricanes and tornadoes combined.

The Atlantic hurricane season appears ready to awaken just as intense summer heat bears down on a significant portion of the country.

There are two near-term risk areas that could produce the first tropical system of the year, and both are a little too close to the U.S. coast for comfort.

An area in the southwest Gulf of Mexico has the greatest chance of becoming the first tropical system. There is also a small window and there is a small chance that the same stormy driving pattern as the Florida rain could develop into a tropical depression off the southeast coast before being washed out to sea this weekend.

High tropical humidity is swirling in the southwest Gulf due to the Central American Gyre: a large, disorganized area of ​​showers and thunderstorms that rotates over Central America and its surrounding waters.

The gyre’s broad tropical rotation and abundant moisture can help systems form in parts of the Caribbean, Gulf of Mexico and even the far eastern Pacific Ocean when other necessary factors – including favorable winds at altitude and warm ocean waters – align.

This could be the case mid-week; The National Hurricane Center says there is a medium chance of a tropical depression forming in the Bay of Campeche in the southwest Gulf. Most of the Gulf of Mexico is heated like a bathtub, so if a tropical system manages to form, it will have enough fuel to strengthen. If something forms, it’s likely to be heading north or northwest.

Regardless of tropical development, a surge of moisture like the one causing the deluges in South Florida will provide much-needed wet weather to parts of Mexico that have been experiencing extreme heat and brutal drought for weeks.

But it will also increase the risk of flooding along the Gulf Coast, especially in areas that get soggy this spring.

Several days of rain head toward the Gulf Coast, from Texas to Alabama, starting Sunday and continuing throughout the week.

The heat doesn’t just make us sweat and kick off hurricane season: It’s also contributed to several notable recent wildfires.

Fire activity is gradually increasing across the country, according to the National Interagency Fire Center. Nearly a dozen large fires are burning in parts of the West, and half of them have broken out in recent days.

The hot and dry conditions that have prevailed since the beginning of the month in the West will continue to increase the risk of wildfires and could worsen ongoing fires. Wildfire fuels, such as grass and plant life, will continue to dry out during this time, making them more likely to ignite or spread.

Winds will also pick up in the region later this weekend and early next week. Gusty winds cause wildfires to spread quickly, as demonstrated by the Corral Fire in California in early June.

Windy conditions could also cause problems next week due to a small but destructive fire in Arizona, about 70 miles northwest of Phoenix, nicknamed the Rose Fire.

The fire destroyed at least 15 structures – including seven homes – as well as at least a dozen vehicles, the Arizona Department of Forestry and Fire Management said Thursday.

The fire had burned at least 166 acres since it broke out Wednesday, but it was only 20% contained as of Thursday evening.

Arizona Department of Forestry and Fire Management/AP

Smoke fills the sky as the Rose Fire burns southeast of Wickenburg, Arizona, Wednesday.

CNN’s Paradise Afshar contributed to this report.

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