WASHINGTON (AP) – A dangerous heat wave is currently breaking March temperature records across the U.S. Southwest, signaling more than just an anomaly in extreme weather. As global temperatures continue to rise due to climate change, these unprecedented weather patterns are becoming increasingly frequent and severe.
Experts are raising alarms over the growing intensity of weather extremes that tend to occur during unusual times and in atypical locations. For example, the Southwest, which typically contends with high temperatures, is now experiencing record numbers well ahead of the summer season. Two Arizona communities recorded temperatures of 112 degrees Fahrenheit (44.4 degrees Celsius) on a recent Friday, a new high for March in the U.S. Southern California reported similar temperatures, with all four locations situated within approximately 50 miles (80.5 kilometers) of one another.
Andrew Weaver, a climate scientist from the University of Victoria, stated, “This is what climate change looks like in real time: extremes pushing beyond the bounds we once thought possible.” He highlighted that events once deemed extraordinary are now an expected occurrence in a warming world. A report by World Weather Attribution, a global consortium of scientists, has determined that March’s heat wave would have been nearly impossible without human-caused climate change.
According to an analysis by the National Oceanic and Atmospheric Administration (NOAA), regions in the U.S. affected by extreme weather have doubled over the past five years compared to two decades ago. The Climate Extremes Index indicates a variety of severe weather events, including heat waves, cold snaps, torrential rain, and drought conditions. The U.S. is currently recording 77% more heat weather records than in the 1970s and 19% more than during the 2010s, resulting in an alarming increase in the frequency and severity of billion-dollar weather disasters.
Bernadette Woods Placky, Chief Meteorologist at Climate Central, expressed concern over the increasing extremity of weather events. She noted the challenges government officials face in adapting to these shifts, as historical data no longer serves as a reliable guide. Craig Fugate, the former director of the Federal Emergency Management Agency (FEMA) until 2017, also remarked on the difficulties in planning for disasters with a changing climate, highlighting how flood maps and surge models are increasingly outdated.
The World Weather Attribution scientists conducted a rapid analysis of the recent heat wave, comparing forecasted temperatures with historical data since 1900 and climate models that incorporate the effects of climate change. Their findings indicated that temperature extremes seen in March 2026 would have been "virtually impossible" without human-induced climate change, attributing an increase of 4.7 to 7.2 degrees Fahrenheit (2.6 to 4 degrees Celsius) to escalating global temperatures.
Climate scientist Chris Field from Stanford University categorized the current Southwest heat wave as a "giant event", with temperatures peaking up to 30 degrees Fahrenheit (16.7 degrees Celsius) above normal. He cited several other extreme weather occurrences over the past six years, including the 2020 Siberian heat wave and the unprecedented 2021 heat wave in the Pacific Northwest.
This worsening pattern of extreme weather—intensified by climate change—transcends high temperatures, as scientists point to increasingly severe storms, flooding events, and droughts. For example, devastating floods have afflicted West Africa in 2022 and 2024, while Iran has been in the grip of a six-year drought that has led to dire consequences. Historical events such as Typhoon Haiyan in 2013 and Superstorm Sandy in 2012 illustrate the growing unpredictability and impact of such natural disasters. Recent wildfires in California have also been exacerbated by heat and drought, underscoring the multifaceted challenges posed by climate change.
Friederike Otto, a climate scientist who coordinates World Weather Attribution, concluded that the surge in extreme weather events and record-breaking occurrences is a direct result of climate change, further emphasizing the urgent need for recognition and action.
