Deadly Waves (IMAGE) Columbia Climate School Caption Researchers have identified meanders in the northern hemisphere jet stream that can suck hot air from the south and cause massive heat waves across widespread regions of North America and Eurasia. This image comes from a 2020 study. Credit Kornhuber et al., Nature Climate Change, 2020 Usage Restrictions Credit must be given. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.