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How mapping 'heat islands' can help cities prepare for extreme heat

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How mapping 'heat islands' can help cities prepare for extreme heat

A thermal imaging device attached to an iPhone shows a range of temperatures with reds and oranges representing hot conditions. Some cities are mapping heat to better understand how to prepare for extreme temperatures.

Britny Cordera/KOSU


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Britny Cordera/KOSU


A thermal imaging device attached to an iPhone shows a range of temperatures with reds and oranges representing hot conditions. Some cities are mapping heat to better understand how to prepare for extreme temperatures.

Britny Cordera/KOSU

Climate change, driven primarily by burning fossil fuels, pushed temperatures so high last year that scientists were astounded when 2023 became the hottest year on record. Communities like Oklahoma City are now preparing for a future with extreme temperatures by understanding which areas are the hottest.

Last year, Oklahoma City joined 14 other cities in a national project through the National Oceanic and Atmospheric Administration (NOAA) to map where heat lingers in neighborhoods. Oklahoma City’s Office of Sustainability, in partnership with the University of Oklahoma, and other environmental organizations, recruited volunteers to act as “citizen scientists” to help researchers gather key data.

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Those citizen scientists attached air quality and heat monitoring sensors to their cars to take air and temperature readings of the hottest neighborhoods in Oklahoma City on an August day last year.

Understanding where heat pockets persist in communities is the first step to cooling those places down — and protecting residents from heat illness. Hongwan Li, an assistant professor in the College of Public Health at the University of Oklahoma, researches air quality and helped collect data last summer.

“If we want to take a deeper look for the heat stress like in our communities, community-based is the most appropriate way to understand the heat stress better,” Li said.

The data from the sensors last summer showed that downtown Oklahoma City was 15 degrees hotter than the outer edges of the city, like neighborhoods near Lake Stanley-Draper in the southeast.

Sarah Terry-Cobo, associate planner for Oklahoma City’s Office of Sustainability, led last year’s heat mapping efforts. She was surprised to find out that Mesta Park – with its large sycamore and oak trees that tower over houses – was one of the hottest areas in Oklahoma City.

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“A more affluent area like Mesta Park has a lot of older tree canopy that’s intact,” Terry-Cobo said. “And that, you know, is still pretty hot compared to some of these other neighborhoods that we were expecting to be very hot.”

Air quality and heat mapping devices are attached to cars. Volunteers then drive a route to collect temperature and air quality data.

Britny Cordera/KOSU


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Britny Cordera/KOSU


Air quality and heat mapping devices are attached to cars. Volunteers then drive a route to collect temperature and air quality data.

Britny Cordera/KOSU

Trees don’t always provide enough cooling because heat gets trapped in roofs, roads, and sidewalks creating what’s called the urban heat island effect.

Terry-Cobo walked around downtown Oklahoma City that rainy, humid August day capturing thermal images on her phone. The high for the day reached 98 degrees.

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The prairie habitat at the Myriad Botanical Gardens in Oklahoma City, for example, had cooler temperatures than the concrete that makes up the core of the city. Thermal imaging put the sidewalk at 93 degrees while tree shade was at 85 degrees.

“What we’re seeing right now in the Myriad Gardens is a great example of a potential cooling strategy for urban heat islands,” she said.

Cooling strategies can come from understanding the hottest parts of urban areas. Since 2017, NOAA has funded the Climate Adaptation Planning and Analytics Heat Watch program (CAPA) to help organize and provide the equipment and results to over 60 communities across the U.S. and internationally.

Joey Williams, the project manager for CAPA Heat Watch, said heat mapping started to help people learn about where extreme heat impacts their lives, and to help cities come up with strategies to address it.

“As the threat of heat continues to rise, people become more aware that heat is an issue and life threatening and it affects different people differently,” Williams said. “Having this kind of awareness that that’s an issue can be a lifesaver.”

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Kansas City, Missouri used its heat mapping data from 2021 to understand where the city lacked tree canopy.

Andy Savastino, chief environmental officer with the city said that helped inform a new policy to preserve the city’s tree canopy.

“Now, any time a developer wants to come into areas where there is an old growth forest, our tree preservation ordinance, which we never had one before, applies so that there is a requirement for developers to replace a percentage of the trees they take down,” he said.

The city of Little Rock, Arkansas found during its heat mapping project last August that the hottest parts of the city didn’t cool off at night.

Lennie Massanelli, the sustainability officer for the city, said that meant temperatures in the morning were hotter than the afternoon.

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“At the very beginning of the day, the 6 to 7 a.m. map showed the hottest pockets of Little Rock, where heat just kind of stayed in one place,” she said.

Oklahoma City’s heat mapping campaign found the city needs more trees and fewer parking lots to help cool off neighborhoods during the hottest months.

Oklahoma City’s sustainability office is developing a guide book this year to help city leaders determine the best ways to adapt to extreme heat. Terry-Cobo hopes that will include everything from changing zoning laws for parking to reclaiming native habitat wherever the city can — all in an effort to cool down some of the hottest parts of the city.

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California’s primary for governor is undecided as candidates vie to be in the top two

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California’s primary for governor is undecided as candidates vie to be in the top two

Xavier Becerra, Democratic gubernatorial candidate for California, and Steve Hilton, Republican gubernatorial candidate for California, shake hands while arriving for a gubernatorial debate at KRON Studios in San Francisco in April.

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SAN FRANCISCO — The primary election for California governor is too close to call, with vote counting continuing Wednesday. Democrat Xavier Becerra and Republican business executive Steve Hilton lead the field with Democrat Tom Steyer in third place.

In California’s unusual primary system, all candidates, regardless of party, appear on a single ballot open to any registered voter. The top two candidates then move on to the general election, even if they’re from the same party. This year, voters had 60 names for governor to choose from.

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The winner will lead the country’s most populous state, where leaders often take on national political prominence. Incumbent Gov. Gavin Newsom is at his two-term limit and could be a Democratic contender for president.

Becerra, former Health and Human Services secretary under President Joe Biden, pitched himself to voters as an experienced political leader who isn’t afraid of President Trump, but his lead caps one of the most surprising and dramatic comebacks in recent state political history. As recently as April, polls were showing Becerra — also a former member of Congress and California attorney general — languishing in single digits in a crowded field.

In his remarks at his watch party in Los Angeles, Becerra noted his underdog status.

“Here in Hollywood’s hometown, we love a good underdog success story,” he said, drawing parallels between his campaign and his immigrant parents’ success story in California. “Guess what? The underdog stayed in the fight. Like my parents, I never gave up. Never stopped putting one foot in front of the other. Never stopped believing in the beacon-like goodness of California. And thankfully, neither did you.”

Hilton is a former Fox News commentator who also served as a political adviser to former British Prime Minister David Cameron. He was endorsed by President Trump in April, helping him to pull ahead of Riverside County Sheriff Chad Bianco, the other major Republican in the race. Hilton has campaigned on the idea that California needs change after 16 years under total Democratic control.

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The race is narrowing down after a tumultuous campaign

At his watch party in Huntington Beach, the British-born candidate — who became an American citizen five years ago — said it was the “honor of his lifetime” to receive over 1 million votes so far.

“Change is coming to California and it’s long overdue,” Hilton said. “We’re not there yet, but it’s looking good. It looks very much as if Californians really will have the chance to vote for change in November and take our state in a new direction.”

Democratic billionaire activist Steyer spent more than $213 million of his own money to boost his candidacy and push a progressive, populist message. While he was trailing Becerra and Hilton on Tuesday night, he said at his watch party in San Francisco that he remains confident he can close the gap in the days ahead.

“Together, we’ve scared the hell out of the corporate interests used to getting their way,” Steyer said. “It might take some time to figure out where this is going. We’re going to wait until every ballot is counted. We’re gonna give democracy a time to work. And we know we finished really strong.”

The early results are not certain to hold, in part because of unusual voting patterns in this primary election: Ballot-tracking data heading into Tuesday evening showed that Republicans were more likely to vote early by mail, while Democratic voters in this deep-blue state held onto their mail-in ballots or chose to vote in person. That’s the reverse of recent elections, which saw more Democrats voting by mail and Republicans tending to vote in person on Election Day.

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The uncertainty on election night capped a race that remained crowded and unsettled to the end. To some extent, the race was defined by who wasn’t running.

Some of the state’s most high-profile Democrats — former Vice President Kamala Harris, U.S. Sen. Alex Padilla and California Attorney General Rob Bonta — all passed on a potential bid to succeed Newsom.

The race was disrupted in April when then-U.S. Rep. Eric Swalwell’s campaign for governor imploded amid allegations of sexual assault and harassment. Swalwell resigned from Congress shortly after the accusations surfaced and has denied assault allegations.

Swalwell had been gaining in polls and racking up high-profile endorsements, and his exit seemed to primarily benefit Becerra, who had been stuck in single digits in many polls. Ultimately, it quieted fears among Democrats who worried that the messy Democratic field could result in Bianco and Hilton winning the top spots in the June primary.

Marisa Lagos covers California politics at KQED and co-hosts the Political Breakdown show and podcast.

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Supreme Court reinstates Republican-favored Alabama congressional districts

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Supreme Court reinstates Republican-favored Alabama congressional districts

The U.S. Supreme Court

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The Supreme Court on Tuesday cleared the way for Alabama to use a congressional district map favored by Republicans.

The court, in an unsigned order, overturned a three-judge district court panel that found that the map is “tainted by intentional race-based discrimination.” The court’s three liberals publicly dissented.

The ruling means that Alabama’s 2026 midterm elections will feature six Republican-leaning districts and one Democratic-leaning one, as opposed to a map with only five safe Republican seats. Democrat Shomari Figures, who represents Alabama’s Second District, will likely lose his seat as a result of the high court’s ruling.

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The story of Alabama’s congressional map is long and tortured. It began in 2021, when the state implemented a new map to account for population changes in the census. The map featured only one majority-black district out of seven, even though the state is more than one-quarter Black.

Voters immediately sued, claiming the map illegally diluted minority votes in violation of the Voting Rights Act and the Constitution. Lower court judges agreed, ruling that the state must draw a map with two districts where Black voters have a realistic chance of electing their candidate of choice. The Supreme Court more than once has ordered Alabama to draw a compliant map.

But the state has refused and instead continued to litigate the case. On Tuesday, that tactic paid off.

What changed? In April, the Supreme Court’s conservative supermajority all but gutted what remains of the Voting Rights Act, ruling that states cannot purposefully draw districts that are majority-minority.

Alabama then asked the high court to reinstate the state’s old map, under the theory that this new ruling meant that it was permissible to use a map with only one majority-Black district. In an unsigned, unexplained order in May, the high court essentially reversed its previous opinions, and allowed Alabama to use the old map for the upcoming midterm elections.

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This set off a flurry of activity in Alabama. By the time the Supreme Court issued its May order, absentee balloting had already begun, using the court-drawn map. So Republican Governor Kay Ivey cancelled elections and scheduled a special primary for August for the affected congressional races.

The case, however, was not over.

In its ruling, the Supreme Court had ordered a lower court panel to continue evaluating Alabama’s map in light of its recent Voting Rights Act decision. And just 15 days after that order, the panel, composed of three Republican judges—two of them Trump appointees—concluded unanimously that even under the Supreme Court’s new standards, the plan for a single black district was “intentionally discriminatory.”

So, once again, Alabama returned to the Supreme Court, arguing that the map was partisan, not racially discriminatory. In short, that the Republican legislature simply drew the map to elect more Republicans. And that under the Supreme Court’s new interpretation of the Voting Rights Act, the GOP map should be allowed to stand.

The court’s conservative agreed, writing that the lower court “did not heed the presumption of legislative good faith.”

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The court’s three liberals publicly dissented, castigating the conservative majority for failing to abide by its 2006 decision in the case of Purcell v. Gonzalez. That decision declared that courts should not change election rules too close to an election.

Justice Sonia Sotomayor, in her dissent, said the court “debases the democratic process” and “corrodes the rule of law by rewarding Alabama’s gamesmanship and outright defiance of court orders.”

Tuesday’s decision is the latest in a series of Supreme Court rulings that could well reshape the 2026 midterm elections, making it much harder for Democrats to prevail.

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Map: 3.7-Magnitude Earthquake Shakes the San Francisco Bay Area

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Map: 3.7-Magnitude Earthquake Shakes the San Francisco Bay Area

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Note: Map shows the area with a shake intensity of 3 or greater, which U.S.G.S. defines as “weak,” though the earthquake may be felt outside the areas shown.  All times on the map are Pacific time. The New York Times

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A minor, 3.7-magnitude earthquake struck in the San Francisco Bay Area on Tuesday, according to the United States Geological Survey.

The temblor happened at 9:44 a.m. Pacific time about 4 miles southeast of Cloverdale, Calif., data from the agency shows.

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U.S.G.S. data earlier reported that the magnitude was 3.6.

As seismologists review available data, they may revise the earthquake’s reported magnitude. Additional information collected about the earthquake may also prompt U.S.G.S. scientists to update the shake-severity map.

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Aftershocks detected

Subsequent quakes have been reported in the same area. Such temblors are typically aftershocks caused by minor adjustments along the portion of a fault that slipped at the time of the initial earthquake.

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Quakes and aftershocks within 100 miles

Aftershocks can occur days, weeks or even years after the first earthquake. These events can be of equal or larger magnitude to the initial earthquake, and they can continue to affect already damaged locations.

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When quakes and aftershocks occurred

 All times are Pacific time. The New York Times

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Sources: United States Geological Survey (epicenter, aftershocks, shake intensity); LandScan via Oak Ridge National Laboratory (population density) | Notes: Shaking categories are based on the Modified Mercalli Intensity scale. When aftershock data is available, the corresponding maps and charts include earthquakes within 100 miles and seven days of the initial quake. All times above are Pacific time. Shake data is as of Tuesday, June 2 at 12:59 p.m. Eastern. Aftershocks data is as of Tuesday, June 2 at 1:59 p.m. Eastern.

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