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.

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

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.

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.

A heat index topping 100 degrees will convert much of the tristate area into a sauna for the next three days, weather officials said Monday in yet another heat advisory.

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.

The blast of heat prompted advisories across much of Massachusetts, Rhode Island, Connecticut, and in Southern New Hampshire and Maine.