What a difference a day makes!Friday marks the start of summer, and the Philadelphia region's weather will be at its nicest and most comfortable for the next 9 to 10 days.Expect sunny skies, low humidity,

Summer will make a dramatic entrance in the U.S. this week with a heat dome that will bring stifling heat and uncomfortable humidity to millions. The heat will be particularly worrisome this

More than 170 million Americans will face dangerous temperatures and humidity in the coming days as a heat dome develops over much of the U.S. The first major heat wave of the year is expected to challenge record temperatures across the central and eastern states from the weekend into next week.