In the beginning, a heat dome evaporates moisture in the soil. But then, the evaporation will significantly raise humidity.

July will make a potentially record-breaking exit this week as a heat dome will create triple-digit feels-like temperatures for millions from Florida to Virginia, prompting heat alerts across the East Coast.

As mercury hits sweltering 46C in places, people urged to stay indoors, stay cool and hydrated, protect young children and animals - Anadolu Ajansı

Tropical activity is picking up in both the Pacific and Atlantic basins as a massive heat dome sends temperatures soaring across the U.S.

A heat dome​ is trapping over 90 million Americans in extreme temperatures this week with the National Weather Service​ issuing heat alerts from Nebraska to Florida.

The NWS has issued a bulletin warning that 100-degree temperatures will likely hit residents in the middle of the US today. The cause for that thermometer spike is a growing heat dome in the Mississippi Valley that should expand to the northeast by the end of the week, potentially affecting more than 100 million people, per Accuweather.

Much of July‘s seemingly intractable hot weather is being fueled by a “heat dome” that has been lingering in the eastern United States for about a month. These slow-moving, high-pressure systems are a weather phenomenon in which a section of high pressure over an area traps heat and humidity for an extended period of time.

First Alert Weather Days have been declared for today through Wednesday with a dangerous heat dome building across Alabama and bringing the hottest days we have seen thus far this summer.