EXPLAINER | What is the ‘Omega Block’ causing Europe’s intense heatwave? (opens original article in a new tab)

An omega block is causing a severe heatwave in Europe, with high pressure leading to extreme temperatures and dry conditions. Climate change is making heatwaves more intense, though its impact on omega block frequency remains unclear.

• An omega block is a weather pattern with high pressure between two low pressure systems that causes prolonged heatwaves
• High pressure during omega blocks leads to hot, dry conditions with suppressed cloud formation
• Climate change is increasing heatwave frequency and intensity, making omega block-related heat more severe
• Scientists are uncertain about climate change's effect on omega block frequency