Summer is notorious for producing punishing heat waves, often referred to as heat domes. Here's what they are.
A heat dome occurs when a ridge of high pressure builds over an area and doesn’t move for up to a week or more. High pressure results in fair weather with lots of sunshine and very few clouds. It also indicates sinking air, and when air sinks, it warms – causing temperatures to rise. The “dome” is created because the air can’t escape. Then, temperatures keep warming, often to uncomfortable or even dangerous levels. Most heat records are set within a heat dome.
Even a small increase in global average temperature can lead to significant increases in the hottest extremes, which are seen during strong and persistent heat domes. Places such as Afghanistan, Papua New Guinea and Central America – including Guatemala, Honduras and Nicaragua – have been targeted as “hot spots” for high-risk heat waves, a 2023 study in the journal Nature Communications found.
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