heat dome

[ heet dohm ]
/ ˈhit ˌdoʊm /

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.

Origin of heat dome

First recorded in 1955–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019