NWS Philadelphia issues a heat warning for parts of Delaware, New Jersey, and southeastern Pennsylvania, with heat index ...

If you factor in the heat index, cities like Houston, Memphis and Cleveland are as hot or hotter than Phoenix this week.

Death Valley is forecast to see heat index values peak at 101 Friday—swaths of the country are bracing for even warmer conditions.

The National Weather Service has issued an Extreme Heat Warning for Philadelphia and the suburbs in Pennsylvania and New ...