HeatRisk Tool Faces Real-World Challenges Amidst Rising US Temperatures

Following its nationwide rollout on Earth Day, the HeatRisk forecasting tool is being tested in real-world conditions as extreme temperatures affect much of the US. Developed by the CDC and NOAA, HeatRisk integrates public health data and weather forecasts to map threatening heat levels across the country, categorizing heat waves from 0 to 4 based on local climatology, time of year, forecasted temperatures, and duration of heat. The tool uses a color-coded system to indicate risk levels, from green (low risk) to magenta (highest risk).

Initially piloted in California in 2013, HeatRisk has been utilized in Western states since 2017 for public safety measures. Its national launch in April has seen broadcasters like The Weather Channel and Fox Weather feature it in reports, while the CDC incorporates it into heat messaging guidelines. HeatRisk’s localized warnings have proven beneficial in regions such as Maricopa County, Arizona, and Sacramento schools, helping manage outdoor activities and public safety.

HeatRisk also includes a Social Vulnerability Index to identify communities most susceptible to heat threats. For example, NWS Seattle collaborates with the King County Regional Homelessness Authority to protect unhoused individuals from extreme heat. Despite some challenges in adapting to the new metric, the tool has been a valuable addition to heat measurement strategies, providing a comprehensive view of heat risks across diverse populations.