A “heat dome” is a weather pattern in which a high-pressure system settles over an area and traps warm air above the ground. Multiple outlets explain that this heat-trapping setup can intensify already-hot conditions and make them last longer than normal, sometimes for several days or even a week or more.
Several sources describe how heat domes are formed when high pressure builds and remains relatively stationary, reducing airflow and limiting the release of heat from the lower atmosphere. As a result, temperatures can stay extremely high and, in some cases, humidity can also contribute to harsher conditions.
One outlet also notes that the overall impact of heat domes is worsening, linking changes in their severity and frequency to a warming planet. Another piece emphasizes that the phenomenon can lead to prolonged, dangerous heat that extends beyond typical summer spikes.
Across the reporting, the core point is consistent: heat domes are driven by high-pressure systems that suppress movement of air and keep heat in place, leading to more extreme and longer-lasting heat events.
