Philadelphia (WPVI) -- The City of Philadelphia declared an Excessive Heat Warning again on Friday as the Delaware Valley's heatwave continued. The declaration activates the Philadelphia Corporation ...

Heat waves can form when a high-pressure system moves into a region and stalls. The system can force warm air downward, acting like a cap as it keeps the cool air near the surface from rising, ...

The bill, introduced ahead of Labor Day, would require employers to provide paid rest breaks and water when the heat index hits 80 degrees Fahrenheit. A worker power washes the sidewalk during an ...

A prolonged heat wave will push temperatures well above normal across central Pennsylvania, with daytime highs expected to reach the mid-70s to low 80s through early next week. Residents should ...

Summer weather is back! At least for your Friday in the Philadelphia area, as high temps will be pushing 90 degrees, yes, 90 in mid-September. The record high is 92, so we're not thinking that, but we ...

Extreme heat can trigger excessive sweating that overwhelms the body’s natural cooling system, potentially leading to heat cramps, heat stroke and even death in severe, untreated cases. An ...