Philadelphia June 27, 2018 6:20 pm NBC10 First Alert Weather: Heat Wave Set to Begin NBC10 First Alert Weather meteorologist Steve Sosna gives the latest on when the heat wave is expected to begin. US & World Videos 3:13 Another beautiful, warm day with dry skies 3:10 Partly sunny and warm Tuesday ahead 3:15 Your look at workweek weather forecast 2:40 Feeling like summer with some chances for showers 2:54 Partly cloudy skies with low chance for passing showers