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

A multiday heat wave is bringing high temperatures and health risks from the Midwest to the Northeast, prompting warnings and emergency measures.

Tens of millions of people across the Midwest and East are enduring another sweltering day of dangerously hot temperatures as a sprawling June heat wave grips much of the U.S.