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heat dome

[ heet-dohm ]
/ ˈhit ˌdoʊm /
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noun Meteorology.

a weather phenomenon in which an area experiences stifling heat when a system of high pressure pushes very warm air downward and keeps it trapped as if in a bubble.

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Origin of heat dome

First recorded in 1955–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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