Like much of the planet, Southern California is expected to experience more heat waves in the future due to Earth’s changing climate. And some of these will feel increasingly humid, as long-term forecasts call for muggy spells more typically associated with Florida or eastern Texas.
To begin to understand what these changes could mean across the greater Los Angeles area, scientists at NASA’s Jet Propulsion Laboratory in Southern California mapped how extreme heat and humidity patterns vary with regional geography. The results underscore how air temperature alone does not tell the full story of dangerous heat.
“We can’t just look at air temperature when we talk about heat wave impacts,” said study author Anamika Shreevastava, a NASA postdoctoral program fellow at JPL. “People tend to get acclimatized to where they live. We have to understand how anomalous conditions are making a difference in what people are used to.”
Climate change is fueling longer, hotter and more frequent heat waves. In the U.S., extreme heat is the No. 1 weather-related killer, causing more deaths than hurricanes and floods, according to the National Weather Service.
Greater Los Angeles is a prime example of an urban heat island – cities and suburbs woven with heat-trapping concrete and asphalt that lead to warmer temperatures than nearby rural areas that have more vegetation. Bordered by mountains and the ocean, the Greater L.A. area encompasses suburbs and skyscrapers, with a dense population and disparities in green space. It includes several counties, tens of thousands of square miles, and more than 18 million people, making it a compelling test bed for heat wave research.
Climate change and urban heat are together fueling different heat waves now. In the 20th century, most heat waves in L.A. were dry. However, humid events have steadily increased in frequency and intensity since 1950 due in part to swelling moisture from the warming sea surface.
In their case study, JPL scientists compared two heat waves that affected the Greater Los Angeles area in the summer of 2020: a prolonged muggy stretch in August and an extremely dry three-day spike in September. During the latter event, record-breaking temperatures soared over 120 degrees Fahrenheit (49 degrees Celsius) in the San Fernando Valley – a densely populated portion of the city of Los Angeles – while scorching winds fanned a destructive wildfire in the nearby San Gabriel Mountains.
For their study, recently published in the Journal of Applied Meteorology and Climatology, the scientists used NASA’s Modern-Era Retrospective Analysis for Research and Applications, version 2 (MERRA-2) dataset – a reanalysis of historical atmospheric observations. They found that both heat waves drove temperatures above the 90th percentile for the August-September climate record in L.A. Using advanced weather modeling, they simulated the heat waves and looked at their impacts across the region.
The researchers found that, although air temperatures were as much as 18 degrees Fahrenheit (10 degrees Celsius) cooler during the muggy August heat wave, the heat stress to human health was more intense than the September event. That’s because the wet-bulb temperature – which relates heat to how well our bodies cool down by sweating – surged due to the humidity.
The results underscore the importance of including humid heat when issuing extreme heat warnings, the scientists said.