Heat dome: how an English word conquered the German language
After this hot summer, I wanted to take a closer look at a word that keeps turning up in the news: "Hitzedom" (heat dome). The German Language Society (GfdS) published an article on it by Angélica Prediger in its Sprachdienst 4–5/2026 issue, and it explained quite a lot to me.
Until 2017 the word was hardly known in German; from 2018 on it appeared in the media more and more often. In newspaper corpora it is attested 147 times in total between 2018 and 2025. It is a direct translation of the English "heat dome", which has been documented since 1969. Other languages have their own images: Spanish says domo de calor or cúpula de calor, Italian says bolla di calore (literally "heat ball"), and Hungarian says hőkupola.
What I find interesting is that the German word has an older rival: Hitzeglocke ("heat bell"), attested since 1959. According to DWDS, both are synonyms. There are also variants such as Hitzedeckel ("heat lid") or Hitzekuppel.
Meteorologically, a heat dome forms under high pressure: the air sinks and acts like a lid, there are no updrafts or cloud formation, and rain is unlikely. This blocked pattern is called an omega block, after the shape of the Greek letter Ω. In cities, sealed surfaces and little shade strengthen the effect. Unlike a heat wave, a heat dome does not move.
Its counterpart is most likely the cold-air lake (Kaltluftsee), a pool of cold air that collects in a hollow in the terrain. The article also points out that cold-air corridors, such as green strips, rivers or wide tree-lined streets, can slow heat domes down.
I like how a single loanword here ties together language history, weather science and urban planning. What is this phenomenon called in your language?
Source: Gesellschaft für deutsche Sprache (GfdS)
Until 2017 the word was hardly known in German; from 2018 on it appeared in the media more and more often. In newspaper corpora it is attested 147 times in total between 2018 and 2025. It is a direct translation of the English "heat dome", which has been documented since 1969. Other languages have their own images: Spanish says domo de calor or cúpula de calor, Italian says bolla di calore (literally "heat ball"), and Hungarian says hőkupola.
What I find interesting is that the German word has an older rival: Hitzeglocke ("heat bell"), attested since 1959. According to DWDS, both are synonyms. There are also variants such as Hitzedeckel ("heat lid") or Hitzekuppel.
Meteorologically, a heat dome forms under high pressure: the air sinks and acts like a lid, there are no updrafts or cloud formation, and rain is unlikely. This blocked pattern is called an omega block, after the shape of the Greek letter Ω. In cities, sealed surfaces and little shade strengthen the effect. Unlike a heat wave, a heat dome does not move.
Its counterpart is most likely the cold-air lake (Kaltluftsee), a pool of cold air that collects in a hollow in the terrain. The article also points out that cold-air corridors, such as green strips, rivers or wide tree-lined streets, can slow heat domes down.
I like how a single loanword here ties together language history, weather science and urban planning. What is this phenomenon called in your language?
Source: Gesellschaft für deutsche Sprache (GfdS)
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