How hot will it get as the humidity builds and a heat dome spreads toward the Northeast? What is a heat dome? Here's what to know and what it means.

It’s the hottest time of the year in the United States and another heat dome is about to make millions of people feel every bit of it.

With the first official 100-degree reading in 13 years on Tuesday, Philadelphia broke a 100-year-old record for a daily ...

A brief thundershower helped keep a bit of a lid on the temperatures Sunday in Philadelphia, although many areas were indeed in the low 90s, kicking off the start of our first major heat wave of ...

Heat alerts will be in effect across the Philadelphia region starting Sunday as Saturday kicks off a multi-day heat wave.

The Philadelphia region is baking under a summer heat wave, with temperatures soaring well into the 90s. Health experts are urging residents to take precautions to stay safe, cool and hydrated.

Life-threatening heat is enveloping the eastern U.S., with some cities bracing for what could be their highest temperatures ...

As previous disasters have laid bare the US’ vulnerabilities to other types of extreme weather, this week is revealing strains in infrastructure and highlighting public health risks when faced with ...

The City of Philadelphia also has declared a heat emergency, as has Montgomery County. Meanwhile, more than 40,000 Peco ...

A potentially record-breaking heat wave is pushing to the East, impacting millions of Americans in several states and cities.

A heat advisory is in place across the Northeast, from Maryland to Maine, where residents are bracing for temperatures 5 to 15 degrees above average.

A Heat Health Emergency has been declared in Philadelphia, where temperatures could break a record set in 1923 amid an early summer heat wave.