The National Weather Service issued an extreme heat warning for a second day as the heat index surpasses 100. See how hot it will get in Delaware.

Most of Delaware is under an extreme heat warning as a heat wave brings the heat index to above 100 degrees. See when temperatures will drop.

The official heat wave will begin today, following yesterday's fall just below the 90-degree mark, thanks to the spotty storms. Expect Monday to approach 100 degrees in many areas across the Delaware Valley,