New York City remains under a heat advisory Thursday, as high temperatures hit the 90s and feel more like triple digits. The National Weather Service allowed Wednesday's heat advisory to remain in effect until 10 p.m. Thursday. It's another First Alert Weather Day as we monitor the dangerous heat and humidity around the area.

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. The heat index -- what the temperature feels like with humidity -- could reach 103 degrees in Philadelphia on Wednesday and Thursday.