Maximum July temperatures averaged over the length of the heat events defined for the WWA study published on 25 July 2023 (left-hand side) and the same but expressed in anomalies with respect to 1950-2023 (right-hand side). The first row shows the Western USA and Mexico, the second Southern Europe and the third row China. Graphic: World Weather Attribution

Extreme heat in North America, Europe, and China in July 2023 made much more likely by global warming – Without human-induced climate change these heat events would have been extremely rare: China heatwave would have been a 1 in 250-year event, and max heat like in July 2023 would have been virtually impossible in the U.S./Mexico region and Southern Europe

25 July 2023 (World Weather Attribution) – Following a record hot June, large areas of the US and Mexico, Southern Europe and China experienced extreme heat in July 2023, breaking many local high temperature records. July 2023 saw extreme heatwaves in several parts of the Northern Hemisphere, including the Southwest of the US and Mexico, […]

Map showing forecast surface temperature highs in the United States, 14 July 2023 - 19 July 2023. Graphic: WeatherBell

Dangerous, record-setting coast-to-coast heat wave to peak in mid-July 2023 – Relentless heat dome will intensify, threatening all-time records

By Matthew Cappucci 14 July 2023 (The Washington Post) – Mid-July is the hottest time of year for many in the Lower 48 states, but the historically intense heat dome that’s sprawled over the southern and western U.S. is exceptional and pushing temperatures into uncharted territory. Triple-digit temperatures are expected to impact at least 10 […]

Aerial view of homes buried in snow in Soda Springs, California in March 2023. Photo: Josh Edelson / The Washington Post

A wet winter won’t stave off the Colorado River’s water cuts – “There are discussions going on but they’re not making much progress. The level of distrust and animosity is really remarkable.”

By Joshua Partlow 3 April 2023 GRAND JUNCTION, Colorado (The Washington Post) – The abundant snow in the Rocky Mountains this year has been a welcome relief, but is not enough to overcome two decades of drought that has pushed major reservoirs along the Colorado River down to dangerous levels, Camille Calimlim Touton, the commissioner […]

John Hornewer sets alarms on his phone in two-minute intervals, after which he puts a quarter in the fill station, as he fills up his 6,000-gallon tanker to haul water from Apache Junction to Rio Verde Foothills. Photo: Caitlin O'Hara / The Washington Post

Arizona city cuts off a neighborhood’s water supply amid drought – “There is no Santa Claus. The megadrought tells us all: water is not a compassion game.”

By Joshua Partlow 16 January 2023 SCOTTSDALE, Arizona (The Washington Post) – The survival — or at least the basic sustenance — of hundreds in a desert community amid the horse ranches and golf courses outside Phoenix now rests on a 54-year-old man with a plastic bucket of quarters. John Hornewer picked up a quarter […]

Heat-related deaths in Maricopa County, Arizona, 2001-2022. The temperature hit 110F or higher on 22 days in 2022, yet it was only the 20th hottest summer on record, according to the National Weather Service (NWS). It did not drop below 80F on 75 percent of nights between June and August. Heat effects are cumulative, and the body cannot begin to recover until the temperature drops below 80F. Data: Maricopa County, office of vital registration and office of medical examiner, Arizona department of health services. Graphic: The Guardian

Summer 2022 was deadliest on record for heat-related mortality in Arizona’s biggest county – Maricopa County’s 359 heat-associated fatalities in 2022 outpace 339 deaths in 2021

By Anita Snow 25 October 2022 PHOENIX (AP) – This summer was the deadliest on record for heat-associated fatalities in Arizona’s largest county amid a growing wave of homelessness. Public health statistics this week confirmed a record 359 such deaths just days before the end of the six-month heat season. The jump in deaths raises questions about […]

Water flows down the Colorado River at the Glen Canyon Dam near Page, Arizona. White surfaces along the banks of the river and lake show previous water levels in the second-largest reservoir in the U.S. Photo: Luis Sinco / Los Angeles Times

New push to shore up shrinking Colorado River could reduce water flow to California – “We are in a dire situation. Every water user, every water use sector, every state has to reduce their water use.”

By Ian James 28 October 2022 (Los Angeles Times) – With the nation’s two largest reservoirs continuing to decline, federal officials announced plans Friday to revise their current rules for dealing with Colorado River shortages and pursue a new agreement to achieve larger reductions in water use throughout the Southwest. The Biden administration announcement represents a […]

A sunken boat that sat underwater for years has been exposed as Lake Mead continues to recede after years of chronic overuse and drought worsened by rising temperatures. Photo: Luis Sinco / Los Angeles Times

Facing “dead pool” risk, California braces for painful water cuts from Colorado River – “It’s very scary. If there’s no river, then you have no community.”

By Ian James 4 September 2022 (Los Angeles Times) – California water districts are under growing pressure to shoulder substantial water cutbacks as the federal government pushes for urgent solutions to prevent the Colorado River’s badly depleted reservoirs from reaching dangerously low levels. California has the largest water entitlement of any state on the Colorado […]

Aerial view of Lake Powell in Page, Arizona on 5 April 2022, showing water levels at a historic low. Photo: RJ Sangosti / MediaNews Group / The Denver Post / Getty Images

A shrinking Lake Powell heralds an even worse water crisis in the Southwest’s future – “These trends are on a tragic collision course, underscoring the urgency once again of concerted action on climate”

By Matthew Rozsa 29 August 2022 (Salon) – As climate change worsens, Americans who live in the Southwest will be hit very, very hard: experts predict that large cities like Phoenix and Las Vegas are going to be uninhabitable within decades, as will the surrounding metropolitan areas in their home states of Arizona and Nevada. Those regions […]

Satellite view of Lake Mead on 6 July 2000 and 3 July 2022. Data: Landsat data from the U.S. Geological Survey. Photo: Lauren Dauphin / NASA Earth Observatory

Image of the Day: Satellite view of Lake Mead in 2000 and 2022 – “Declining water levels due to climate change and 20 years of ongoing drought have reshaped the park’s shorelines”

By Michael Carlowicz 20 July 2022 (NASA Earth Observatory) – Continuing a 22-year downward trend, water levels in Lake Mead stand at their lowest since April 1937, when the reservoir was still being filled for the first time. As of July 18, 2022, Lake Mead was filled to just 27 percent of capacity. The largest reservoir in the […]

Lake Mead water levels, 2017-2022. Graphic: Water-Data.com

Drought-stricken U.S. warned of looming “dead pool” – “It’s like watching this slow-motion catastrophe kind of unfold”

By Regan Morris and Sophie Long 4 June 2022 LOS ANGELES (BBC News) – A once-in-a-lifetime drought in the western part of the US is turning up dead bodies – but that’s the least of people’s worries. Sitting on the Arizona-Nevada border near Las Vegas, Lake Mead – formed by the creation of the Hoover […]

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