Officials have warned residents from coast to coast to heed the "heat dome" torching the country and creating another record-hot June - but what is this weather phenomenon? A heat dome ...

To understand what a heat dome is, some basic concepts in meteorology, such as atmospheric pressure, are important to know. As the Earth spins, eddies of dense air circulate in the upper atmosphere.

Mexico has been grappling with a severe heatwave due to a heat dome, which has now extended into the southern United States, causing extreme temperatures across a vast region. Definition of a Heat ...