The U.S. Is Set to Roast This Week Under a Potentially Record-Setting Heat Wave

The only thing worse than the hottest time of summer is a heat wave on top of the hottest time of summer. And lo and behold, that’s exactly what the eastern U.S. is to deal with.

A powerful heat dome coupled with disgustingly moist air will envelop the country from the Rockies to the Eastern Seaboard starting on Wednesday and peaking on Friday and Saturday. During that time, an astounding 290 million people could experience temperatures above (and in some cases well above) 90 degrees Fahrenheit. Records could fall and cities are already preparing for dangerous heat by opening cooling centers. If this sounds like climate change, well, yeah this is basically what it looks like.

The cause of the dire heat is a bump in the jet stream. The fast-moving river of air running from west to east can act like a dam, separating cooler air to the north from hotter, humid air to the south. A blossoming area of high pressure over the eastern two thirds of the country will push the jet stream further north, allowing heat to build and humid air to come up from the tropics. The high pressure also means sunny skies, which will create a feedback loop of more heat and more intense high pressure. Temperatures are expected to rise 10-20 degrees Fahrenheit above normal.

Excessive heat warnings blanket the Upper Midwest and parts of the Mid-Atlantic with the National Weather Service warning “[d]angerously high temperatures and humidity could quickly cause heat stress or heat stroke if precautions are not taken.” Temperatures will climb into the upper 90s and low 100s from Texas to Iowa to New York.

But add in the humidity and you have a recipe for sultry conditions normally seen in places like the Texas Gulf Coast as far north Iowa. The combined heat plus humidity means some cities could experience a heat index above 110 degrees Fahrenheit during the day. The National Weather Service’s Philadelphia office emphasized the risks noting the high heat index will create a “DANGEROUS SITUATION.”

Cities will be particularly hard hit due to the urban heat island effect. All the paved surfaces absorb heat throughout the day and radiate it well into the night. That means overnight lows will not be so low, posing a huge public health risk. In Washington, D.C., overnight low temperatures are forecast to stay above 80 degrees Fahrenheit and there’s an outside chance the District could see its warmest night ever recorded according to Capital Weather Gang (that would be 84 degrees Fahrenheit, a record set in 1983 and tied in 2011).

In response to the blanket of heat descending on the U.S., Philadelphia along with other cities are opening cooling centers for those lacking access to air conditioning. Cities are also facing down the prospect of blackouts like the one that hit New York last week as their grids strain to handle the load of increased air conditioner use.

This round of heat perfectly encapsulates what climate change is doing to our weather. Rising background temperatures have given heat waves a springboard that has made them increasingly common and more intense. Last month’s record-smashing heat wave in Europe, for example, was at least five times more likely due to climate change according to a rapid response analysis. Overnight lows are also rising faster than daytime highs in another symptom of climate change. That add more strain on people’s health, particularly kids and the elderly, by reducing the amount of time they have to cool off. 

And then there’s the combo of heat and humidity itself, which a newly released Union of Concerned Scientists (UCS) report shows will become more common and dangerous in the coming century. Many of the locations sweltering this week are likely to see even hot, humid weather in the future including some days that in UCS’ estimation will be “off the charts” from what was once normal.

So while there’s no particular analysis (yet) of this heat wave’s relationship with climate change, it certainly fits a pattern and serves as a reminder heat will only get worse. That’s why we’re all probably going to be living in Siberia by the end of the century.


more recommended stories

  • Smoke Has Blotted Out the Sun in São Paulo as the Amazon Burns

    Smoke from human-ignited fires across the.

  • Anti-Protest Laws Are a Sign of Weakness

    Photo: AP Here is a simple.

  • Icelanders Mourn Loss of Okjökull Glacier With Ceremony, Plaque

    The shrinking of the Okjökull glacier.

  • Big Donors Are Pulling Out of Brazil’s Amazon Fund; That Could Spell Trouble for the Rainforest

    Photo: Getty Norway and Germany have.

  • Portugal Is Using Goats to Prepare for Wildfires, But There’s Not Enough Shepherds

    Goats used to clear brush in.

  • Elizabeth Warren’s Latest Plan Tackles U.S. Injustices Against Tribes and Their Lands

    Photo: Getty Elizabeth Warren is a.

  • Invasive Pests Are Devastating American Forests at an Alarming Rate

    New findings show that invasive species.

  • Hundreds Dead, a Million Displaced as Monsoon Rains Inundate India

    Look at all that water.Photo: AP.

  • Newark’s Lead-Tainted Water Crisis Is Getting Worse

    Photo: AP When Al Moussab had.

  • A Coalition of 22 States Are Suing the Trump Administration Over Its Weak Coal Rule

    New York State attorney general Letitia.

  • Lightning Struck Near the North Pole as the Arctic Continues to Unravel

    Photo: AP In the scheme of.

  • Endangered Species Act Faces Gutting by Trump Administration

    Photo: Getty At a time when.

  • So, Salmon Cannons Are A Thing

    Photo: Jeff Mitchell (Getty) A viral.

  • At Least 22 Dead, Over a Million Reported Displaced as Typhoon Lekima Makes Landfall in Eastern China

    At least 22 deaths have been.

  • Trump Administration Authorizes ‘Cyanide Bombs’ to Kill Feral Hogs. Seriously.

    Photo: Eric Gay (AP) On Thursday.

  • Mauna Kea’s Thirty Meter Telescope Is the Latest Front in the New Fight for Indigenous Sovereignty

    Native Hawaiian activists pray at the.

  • Twin Typhoons Approach East Asia With Terrifying Force

    Super Typhoon Lekima and Typhoon KrosaGIF:.

  • Welp, Using Volcanoes to Understand Geoengineering Might Not Really Work

    Eruption of Mount Pinatubo in the.

  • If You Think 30-50 Feral Hogs Sounds Bad, Just Wait

    Photo: Eric Gay (AP) Hey, it’s.

  • A Global Water Emergency Is Right Around the Corner—Unless We Stop It

    Photo: AP When Chennai, India’s main.

  • ‘Surprise’ Ocean Heat Waves Are Becoming More Common

    Photo: Getty There are two flavors.

  • July ‘Equalled, If Not Surpassed’ Record for World’s Hottest Month

    Photo: AP Sometimes the headline says.

  • Greenland Lost 12.5 Billion Tons of Ice in Record-Breaking, Single-Day Meltdown

    Image: Sean Gallup (Getty) After Greenland.

  • Climate Change Has Made Our Stormwater Infrastructure Obsolete

    Photo: AP We are not ready.

  • This Satellite Image Shows Everything Wrong With Greenland Right Now

    Photo: Getty If you could sum.

  • California Is First State Where Utilities Must Tell Customers if Their Water Is Contaminated by Dangerous Chemicals

    Photo: Getty If you don’t know.

  • Thunderstorms, 70 MPH Winds Could Affect Up to 52 Million People in the Northeast Today

    Photo: AP Powerful storms are roaring.

  • This Coalnado Is About as 2019 as It Gets

    GIF: Meredith Garofalo (Twitter) If last.

  • Are We Watching the Arctic Pass a Tipping Point This Summer?

    Wildfires burning in Siberia on July.

  • Why We’re Not Moving Forward With Our Climate Summit

    Illustration: Illustration: G/O Media/Getty A good.

  • Vietnam Seizes 275-Pound Haul of Rhino Horns, Seven Frozen Tiger Carcasses

    Image: Elaine Thompson (AP) In a.

  • Europe’s Heat Wave Threatens Record Melting of Greenland Ice Sheet

    The Greenland ice sheetPhoto: AP A.