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You didn't see it often because it's a specific characteristic of the jet stream in a bulb or loop - the heat dome forms in it - and that didn't happen often at all until global warming made the jet stream all perturbed.
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Clearly the people in Room Z hired a marketing consultant who told them they needed special names for all sorts of natural phenomena... I presume because it is supposed to attract the people's attention. Now we have heat domes and red wolf moons.