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The oldest climate story isn’t about a wildfire or a hurricane, a heat wave or a drought. It’s about a flood.
“The deluge is terrifying not just for its destructive capacity but also for the way it undoes all that has been accomplished, brings us back to the fathomless chaos of beginning,” The New Yorker’s Avi Steinberg writes of this most primordial human fear, the story of which has been echoed across cultures and religions from the Mesopotamian Epic of Gilgamesh to the Bible’s Old Testament to the Ancient Greek Deucalion Myth to stories told by Native peoples across North America. It might also be humankind’s oldest cautionary tale: When the rain starts and the waters begin to rise, pay attention.
In the United States, floods are the deadliest extreme weather phenomenon after heat waves. In particular, flash floods — which the National Oceanic and Atmospheric Administration distinguishes as flooding that “begins within 6 hours, and often within 3 hours, of ... heavy rainfall” — often take people by surprise, or are dangerously underestimated.
With Hurricane Hilary threatening to dump potentially a year’s worth of rain on parts of the southwestern United States in the span of 72 hours, learning how to react to rising waters ahead of time can be life-saving. This is what you need to know.
Unlike learning your personal wildfire risk, which is relatively easy, it can be frustrating to try to figure out the flood risk of your home.
FEMA publishes flood maps (you can search by your address here), but the shading key can be hard to make out and I had difficulty getting the images to load. I had my best luck navigating to this version of the map, clicking on the location I was interested in, then clicking to the second page of the pop-up information, where you will see “Flood Hazard Zones” followed by a letter. The letters B, C, and X designate moderate- to low-risk flood areas (though the risk in these locations is not non-existent!) while high-risk areas are marked with A or V.
An example of where to find your individual flood hazard zone on the FEMA flood map.FEMA
Personally, I preferred the clear information laid out at RiskFactor.com. The website told me my neighborhood’s risk (I live by the river in New York City, so mine is “moderate”) and the number of properties in the area that have a “greater than ... 26% chance of being severely affected by flooding over the next 30 years” (for my neighborhood, 16%!). The website will even estimate the “max depth of flooding” of a specific home or building for this year and in the next 30 years.
If you are in a moderate- to high-risk area on either map, you should take steps to prepare for a flash flood. Even if you score lower, you might want to consider preparing your house because minimal risk doesn’t denote zero risk.
Either way, you should read the below section about “what to do if you’re in a car during a flash flood,” since such a scenario can happen to anyone.
You don’t have to wait for a flash flood warning to begin to prepare for the worst. But if you’re in a situation where you can anticipate flooding — like much of Southern California, Nevada, and southwestern Arizona can right now — you should prepare ahead of time to run errands so you won’t need to leave the house during the storm. Keep in mind, the best way to stay safe during a flash flood is to not encounter the flood in the first place.
Make sure you have enough food for several days, as well as enough pet food for your animals. Also be sure to pick up any prescriptions or medications you might need. Anticipate any other reasons why you might need to leave your home and try to prevent or limit them ahead of time.
Confirm that the contents of your “go bag” or emergency evacuation kit are up-to-date. Here’s a generic checklist of what should go in it, as well as a version in Spanish.
Check the batteries in your flashlights and charge backup batteries for electronics like cell phones, in case the power goes out.
Clean up your yard if you have time; secure outdoor furniture so it doesn’t get blown around.
Prepare electricity-free entertainment options (now is the time to start brushing up on gin rummy).
Check on neighbors or relatives who might not be aware of the coming storm or have made preparations yet.
I can't believe I have to write this, but absolutely do not order Doordash or Uber Eats or food or products from any other courier service during flash flood conditions. Doing so puts other people in direct danger. Your ramen craving can be satisfied later.
Never wait out a storm in a basement or an apartment that is below ground level if you live in an area with moderate to high flood risk; move to a higher floor or find a different location to shelter in. Even if your home or basement has been okay in previous rainstorms, major flood events can overwhelm city sewer systems and back up water into areas it hasn’t reached before. As Reza Khanbilvardi, a professor of civil engineering and hydrology at City College of New York, told Gothamist after Hurricane Ida killed dozens in New York, New Jersey, and Connecticut in 2021, “Apartments in cellars and basements can be death traps.” Paved urban areas can be especially dangerous in these conditions.
Follow potential evacuation alerts on your phone or on a radio (yes, they still exist!). Sign up for alerts now if you haven’t already.
Seal your important documents in a gallon-size freezer bag or other waterproof bag if you anticipate needing to evacuate, The New York Times suggests.
Unplug electronics and move any valuables to higher floors or locations if you have time to prepare for an evacuation.
If water enters your home, evacuate immediately with your go bag. Do not wait or try to retrieve any additional items. One of the most common ways people get hurt during flash floods is by waiting too long to evacuate. Use your best judgment — if it feels safer to climb to a higher floor than to try to drive to higher ground, do so, but avoid sheltering in an attic where FEMA warns you could get trapped. “Go on the roof only if necessary,” FEMA writes, and “signal for help.”
Do not attempt to walk or swim through floodwaters. Six inches of moving water is enough to knock an adult off their feet. Electrocution is also the second-biggest cause of death during a flood after drowning; never attempt to turn off a circuit breaker box or touch appliances if you are wet or standing in water.
If you come in contact with floodwaters, be sure to wash that area of your body very well when you reach safety.
If at all possible, avoid driving during flash flood conditions. Of course, this isn’t always possible — often people are out when they get caught in a storm. The National Weather Service reports that nearly half of flash-flood fatalities are vehicle-related and the “majority” of victims are male.
First and foremost, never, ever drive through floodwaters or around a roadblock or barrier. “Turn around, don’t drown” is a well-worn NWS slogan for a reason. Just 6 inches of flowing water can move a car and just 12 inches can carry it away — it doesn’t matter how good of a driver you are.
Additionally, even if the water looks shallow, it might not be. “Do not attempt to cross a flooded road even if the car in front of you made it through,” meteorologist Bonnie Schneider writes in her book Extreme Weather.
If your car stalls in water, first responders want you to remember “seatbelt, windows, out.” Do not waste valuable time trying to call 911 and wait for rescue. Unbuckle immediately so you are free to move. Then roll down the windows so that if the car’s electrical system shorts out, you still have a means of escape. (As a backup, buy a “Lifehammer” to punch your way through the window and out of your car. If you do not have a Lifehammer or something similar, the pointy metal ends of a headrest can work in a pinch, The New York Times reports.)
At this point, there is “no right answer,” Joseph Bushra, the medical director with Narberth Ambulance, told WHYY. You need to assess the situation. If it is safe to exit your car and escape to higher ground, do so, but plan your path before getting out of the car and remember, just 6 inches of water can knock an adult over.
If it is not safe to try to make it to higher ground, then you need to get on top of your car. Turn on your hazard lights to make the car visible to first responders. Evacuate children first, starting with the oldest child, and tell them to hang onto whatever they can, The New York Times advises. Once you have evacuated and are on top of your car, then call 911.
It’s not called a “worst-case scenario” for nothing. So what do you do if you end up in the water during a flash flood?
Your number one priority should be to try to get out of the water as quickly as you can. Climb a tree, a building, a car or truck, or head toward any available higher ground.
If you are forced to swim, move perpendicular to the current. Keep in mind this is a last possible resort: “People need to realize that most people who lose their footing in a flash flood don’t get out,” Julie Munger, the founder of Sierra Rescue International, told The New York Times.
If swimming to safety isn’t possible, the Riverside County Fire Department recommends orienting your body so you’re on your back, with your feet down-current, so you can use them to move debris out of the way. “Most victims in swift water die when they get pinned against obstacles, or get trapped in submerged debris and vegetation,” the department writes. Get out of the water or on top of something as quickly as possible — and hold on tight.
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On a new plan for an old site, tariffs on Canada, and the Grain Belt Express
Current conditions: Phoenix will “cool” to 108 degrees Fahrenheit today after hitting 118 degrees on Thursday, its hottest day of the year so far • An extreme wildfire warning is in place through the weekend in Scotland • University of Colorado forecasters decreased their outlook for the 2025 hurricane season to 16 named storms, eight hurricanes, and three major hurricanes after a quiet June and July.
President Trump threatened a 35% tariff on Canadian imports on Thursday, giving Prime Minister Mark Carney a deadline of August 1 before the levies would go into effect. The move follows months of on-again, off-again threats against Canada, with former Canadian Prime Minister Justin Trudeau having successfully staved off the tariffs during talks in February. Despite those earlier negotiations, Trump held firm on his 50% tariff on steel and aluminum, which will have significant implications for green manufacturing.
As my colleagues Matthew Zeitlin and Robinson Meyer have written, tariffs on Canadian imports will affect the flow of oil, minerals, and lumber, as well as possibly break automobile supply chains in the United States. It was unclear as of Thursday, however, whether Trump’s tariffs “would affect all Canadian goods, or if he would follow through,” The New York Times reports. The move follows Trump’s announcement this week of tariffs on several other significant trade partners like Japan and South Korea, as well as a 50% tariff on copper.
The long beleaguered Lava Ridge Wind Project, formally halted earlier this year by an executive order from President Trump, might have a second life as the site for small modular reactors, Idaho News 6 reports. Sawtooth Energy Development Corporation has proposed installing six small nuclear power generators on the former Lava Ridge grounds in Jerome County, Idaho, drawn to the site by the power transmission infrastructure that could connect the region to the Midpoint Substation and onto the rest of the Western U.S. The proposed SMR project would be significantly smaller in scale than Lava Ridge, which would have produced 1,000 megawatts of electricity on a 200,000-acre footprint, sitting instead on 40 acres and generating 462 megawatts, enough to power 400,000 homes.
Sawtooth Energy plans to hold four public meetings on the proposal beginning July 21. The Lava Ridge Wind Project had faced strong local opposition — we named it the No. 1 most at-risk project of the energy transition last fall — due in part to concerns about the visibility of the turbines from the Minidoka National Historic Site, the site of a Japanese internment camp.
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Republican Senator Josh Hawley of Missouri said on social media Thursday that Energy Secretary Chris Wright had assured him that he will be “putting a stop to the Grain Belt Express green scam.” The Grain Belt Express is an 804-mile-long, $11 billion planned transmission line that would connect wind farms in Kansas to energy consumers in Missouri, Illinois, and Indiana, which has been nearing construction after “more than a decade of delays,” The New York Times reports. But earlier this month, Missouri Attorney General Andrew Bailey, a Republican, put in a request for the local public service commission to reconsider its approval, claiming that the project had overstated the number of jobs it would create and the cost savings for customers. Hawley has also been a vocal critic of the project and had asked the Energy Department to cancel its conditional loan guarantee for the transmission project.
New electric vehicles sold in Europe are significantly more environmentally friendly than gas cars, even when battery production is taken into consideration, according to a new study by the International Council on Clean Transportation. Per the report, EVs produce 73% less life-cycle greenhouse gas emissions than combustion engine cars, even considering production — a 24% improvement over 2021 estimates. The gains are also owed to the large share of renewable energy sources in Europe, and factor in that “cars sold today typically remain on the road for about 20 years, [and] continued improvement of the electricity mix will only widen the climate benefits of battery electric cars.” The gains are exclusive to battery electric cars, however; “other powertrains, including hybrids and plug-in hybrids, show only marginal or no progress in reducing their climate impacts,” the report found.
Aryna Sabalenka attempts to cool down during her Ladies' Singles semi-final at Wimbledon on Thursday.Julian Finney/Getty Images
With the United Kingdom staring down its third heatwave in a month this week, a new study warns of dire consequences if homes and cities do not adapt to the new climate reality. According to researchers at the University College London and the London School of Hygiene and Tropical Medicine, heat-related deaths in England and Wales could rise 50-fold by the 2070s, jumping from a baseline of 634 deaths to 34,027 in a worst-case scenario of 4.3 degrees Celsius warming, a high-emissions pathway.
The report specifically cited the aging populations of England and Wales, as older people become more vulnerable to the impacts of extreme heat. Low adoption of air conditioning is also a factor: only 2% to 5% of English households use air conditioning, although that number may grow to 32% by 2050. “We can mitigate [the] severity” of the health impacts of heat “by reducing greenhouse gas emissions and with carefully planned adaptations, but we have to start now,” UCL researcher Clare Heaviside told Sky News.
This week, Centerville, Ohio, rolled out high-tech recycling trucks that will use AI to scan the contents of residents’ bins and flag when items have been improperly sorted. “Reducing contamination in our recycling system lowers processing costs and improves the overall efficiency of our collection,” City Manager Wayne Davis said in a statement about the AI pilot program, per the Dayton Daily News.
Or at least the team at Emerald AI is going to try.
Everyone’s worried about the ravenous energy needs of AI data centers, which the International Energy Agency projects will help catalyze nearly 4% growth in global electricity demand this year and next, hitting the U.S. power sector particularly hard. On Monday, the Department of Energy released a report adding fuel to that fire, warning that blackouts in the U.S. could become 100 times more common by 2030 in large part due to data centers for AI.
The report stirred controversy among clean energy advocates, who cast doubt on that topline number and thus the paper’s justification for a significant fossil fuel buildout. But no matter how the AI revolution is powered, there’s widespread agreement that it’s going to require major infrastructure development of some form or another.
Not so fast, says Emerald AI, which emerged from stealth last week with $24.5 million in seed funding led by Radical Ventures along with a slew of other big name backers, including Nvidia’s venture arm as well as former Secretary of State John Kerry, Google’s chief scientist Jeff Dean, and Kleiner Perkins chair John Doerr. The startup, founded and led by Orsted’s former chief strategy and innovation officer Varun Sivaram, was built to turn data centers from “grid liabilities into flexible assets” by slowing, pausing, or redirecting AI workloads during times of peak energy demand.
Research shows this type of data center load flexibility could unleash nearly 100 gigawatts of grid capacity — the equivalent of four or five Project Stargates and enough to power about 83 million U.S. homes for a year. Such adjustments, Sivaram told me, would be necessary for only about 0.5% of a data center’s total operating time, a fragment so tiny that he says it renders any resulting training or operating performance dips for AI models essentially negligible.
As impressive as that hypothetical potential is, whether a software product can actually reduce the pressures facing the grid is a high stakes question. The U.S. urgently needs enough energy to serve that data center growth, both to ensure its economic competitiveness and to keep electricity bills affordable for Americans. If an algorithm could help alleviate even some of the urgency of an unprecedented buildout of power plants and transmission infrastructure, well, that’d be a big deal.
While Emerald AI will by no means negate the need to expand and upgrade our energy system, Sivaram told me, the software alone “materially changes the build out needs to meet massive demand expansion,” he said. “It unleashes energy abundance using our existing system.”
Grand as that sounds, the fundamental idea is nothing new. It’s the same concept as a virtual power plant, which coordinates distributed energy resources such as rooftop solar panels, smart thermostats, and electric vehicles to ramp energy supply either up or down in accordance with the grid’s needs.
Adoption of VPPs has lagged far behind their technical potential, however. That’s due to a whole host of policy, regulatory, and market barriers such as a lack of state and utility-level rules around payment structures, insufficient participation incentives for customers and utilities, and limited access to wholesale electricity markets. These programs also depend on widespread customer opt-in to make a real impact on the grid.
“It’s really hard to aggregate enough Nest thermostats to make any kind of dent,”” Sivaram told me. Data centers are different, he said, simply because “they’re enormous, they’re a small city.” They’re also, by nature, virtually controllable and often already interconnected if they’re owned by the same company. Sivaram thinks the potential of flexible data center loads is so promising and the assets themselves so valuable that governments and utilities will opt to organize “bespoke arrangements for data centers to provide their services.”
Sivaram told me he’s also optimistic that utilities will offer data center operators with flexible loads the option to skip the ever-growing interconnection queue, helping hyperscalers get online and turn a profit more quickly.
The potential to jump the queue is not something that utilities have formally advertised as an option, however, although there appears to be growing interest in the idea. An incentive like this will be core to making Emerald AI’s business case work, transmission advocate and president of Grid Strategies Rob Gramlich told me.
Data center developers are spending billions every year on the semiconductor chips powering their AI models, so the typical demand response value proposition — earn a small sum by turning off appliances when the grid is strained — doesn’t apply here. “There’s just not anywhere near enough money in that for a hyperscaler to say, Oh yeah, I’m gonna not run my Nvidia chips for a while to make $200 a megawatt hour. That’s peanuts compared to the bazillions [they] just spent,” Gramlich explained.
For Emerald AI to make a real dent in energy supply and blunt the need for an immediate and enormous grid buildout, a significant number of data center operators will have to adopt the platform. That’s where the partnership with Nvidia comes in handy, Sivaram told me, as the startup is “working with them on the reference architecture” for future AI data centers. “The goal is for all [data centers] to be potentially flexible in the future because there will be a standard reference design,” Sivaram said.
Whether or not data centers will go all in on Nvidia’s design remains to be seen, of course. Hyperscalers have not typically thought of data centers as a flexible asset. Right now, Gramlich said, most are still in the mindset that they need to be operating all 8,760 hours of the year to reach their performance targets.
“Two or three years ago, when we first noticed the surge in AI-driven demand, I talked to every hyperscaler about how flexible they thought they could be, because it seemed intuitive that machine learning might be more flexible than search and streaming,” Gramlich told me. By and large, the response was that while these companies might be interested in exploring flexibility “potentially, maybe, someday,” they were mostly focused on their mandate to get huge amounts of gigawatts online, with little time to explore new data center models.
“Even the ones that are talking about flexibility now, in terms of what they’re actually doing in the market today, they all are demanding 8,760 [hours of operation per year],” Gramlich told me.
Emerald AI is well aware that its business depends on proving to hyperscalers that a degree of flexibility won’t materially impact their operations. Last week, the startup released the results of a pilot demonstration that it ran at an Oracle data center in Phoenix, which proved it was able to reduce power consumption by 25% for three hours during a period of grid stress while still “assuring acceptable customer performance for AI workloads.”
It achieved this by categorizing specific AI tasks — think everything from model training and fine tuning to conversations with chatbots — from high to low priority, indicating the degree to which operations could be slowed while still meeting Oracle’s performance targets. Now, Emerald AI is planning additional, larger-scale demonstrations to showcase its capacity to handle more complex scenarios, such as responding to unexpected grid emergencies.
As transmission planners and hyperscalers alike wait to see more proof validating Emerald AI’s vision of the future, Sivaram is careful to note that his company is not advocating for a halt to energy system expansion. In an increasingly electrified economy, expanding and upgrading the grid will be essential — even if every data center in the world has a flexible load profile.
’We should be building a nationwide transmission system. We should be building out generation. We should be doing grid modernization with grid enhancing technologies,” Sivaram told me. “We just don’t need to overdo it. We don’t need the particularly massive projections that you’re seeing that are going to cause your grandmother’s electricity rates to spike. We can avoid that.”
The saga of the Greenhouse Gas Reduction Fund takes another turn.
On July 3, just after the House voted to send the reconciliation bill to Trump’s desk, a lawyer for the Department of Justice swiftly sent a letter to the U.S. Court of Appeals for the D.C. Circuit. Once Trump signed the One Big Beautiful Bill Act into law, the letter said, the group of nonprofits suing the government for canceling the biggest clean energy program in the country’s history would no longer have a case.
It was the latest salvo in the saga of the Greenhouse Gas Reduction Fund, former President Joe Biden’s green bank program, which current Environmental Protection Agency Administrator Lee Zeldin has made the target of his “gold bar” scandal. At stake is nearly $20 billion to fight climate change.
Congress created the program as part of the Inflation Reduction Act in 2022. It authorized Biden’s EPA to award that $20 billion to a handful of nonprofits that would then offer low-cost loans to individuals and organizations for solar installations, building efficiency upgrades, and other efforts to reduce emissions. The agency announced the recipients last summer, before its September deadline to get the funds out.
Then Trump took office and ordered his agency heads to pause and review all funding for Inflation Reduction Act programs.
In early March, buoyed by a covert video of a former EPA employee making an unfortunate and widely misunderstood comparison of the effort to award the funding to “throwing gold bars off the edge” of the Titanic, Zeldin notified the recipients that he was terminating their grant agreements. He cited “substantial concerns” regarding “program integrity, the award process, programmatic fraud, waste, and abuse, and misalignment with agency’s priorities.”
In court proceedings over the decision, the government has yet to cite any specific acts of fraud, waste, or abuse that justified the termination — a fact that the initial judge overseeing the case pointed out in mid-April when she ordered a preliminary injunction blocking the EPA from canceling the grants. But the EPA quickly appealed to the D.C. Circuit Court, which stayed the lower court’s injunction. The money remains frozen at Citibank, which had been overseeing its disbursement, as the parties await the appeals court’s decision.
As all of this was playing out, Congress wrote and passed the One Big Beautiful Bill Act. The new law rescinds the “unobligated” funding — money that hasn’t yet been spent or contracted out — from nearly 50 Inflation Reduction Act programs, including the Greenhouse Gas Reduction Fund. According to an estimate from the Congressional Budget Office, the remaining balance in the fund was just $19 million.
The Trump administration, however, is arguing in court that the OBBBA doesn’t just recoup that $19 million, but also the billions in awards at issue in the lawsuit. Congress has rescinded “the appropriated funds that plaintiffs sought to reinstate through this action,” Principal Deputy Assistant Attorney General Yaakov Roth wrote in his July 3 letter, implying that the awards were no longer officially “obligated” and that all of the money would have to be returned. Therefore, “it is more clear than ever that the district court’s preliminary injunction must be reversed,” he wrote.
Roth cited a statement that Shelley Moore Capito, chair of the Senate Environment and Public Works Committee, made on the floor of the Senate in June. She said she agreed with Zeldin’s decision to cancel the Greenhouse Gas Reduction Fund grants, and that it was Congress’ intent to rescind the funds that “had been obligated but were subsequently de-obligated” — about $17 billion in total. She did not acknowledge that Zeldin’s decision was being actively litigated in court.
On Monday, attorneys for the plaintiffs fired back with a message to the court that the reconciliation bill does not, in fact, change anything about the case. They argued that the EPA broke the law by canceling the grants, and that the OBBBA can’t retroactively absolve the agency. They also served up a conflicting statement that Capito made about the fund to Politico in November. “We’re not gonna go claw back money,” she said. “That’s a ridiculous thought.”
Capito’s colleague Sheldon Whitehouse, a Democrat, offered additional evidence on the floor of the Senate Wednesday. He cited the Congressional Budget Office’s score of the repeal of the program of $19 million, noting that it was the amount “EPA had remaining to oversee the program” and that “at no point in our discussions with the majority, directly or in our several conversations with the Parliamentarian, was this score disputed.” Whitehouse also called up a previous statement made by Republican Representative Morgan Griffith, a member of the House Energy and Commerce Committee, during a markup of the bill. “I just want to point out that these provisions that we are talking about only apply as far, as this bill is concerned, to the unobligated balances,” Griffith said.
Regardless, it will be up to the D.C. Circuit Court as to whether the lower court’s injunction was warranted. If it agrees, the nonprofit awardees may still, in fact, be able to get the money flowing for clean energy projects.
“Wishful thinking on the part of DOJ does not moot the ongoing litigation,” Whitehouse said.