The combination of hot temperatures and very muggy weather will create dangerous conditions for outdoor activities each afternoon through midweek.

The National Weather Service released an extreme heat warning at 2:32 p.m. on Tuesday in effect until 9 p.m. for Marion, ...

The top heat index in Washington on a sultry Tuesday appeared to be 103. The heat index, the “feels-like” temperature, ...

A dangerous heat wave continues to scorch a large part of the United States, with more than 130 million people under extreme ...

The heat index is a measure of how hot it really feels on your body when relative humidity is factored in with the actual air ...

An extreme heat warning and an extreme heat watch were issued by the National Weather Service in Jacksonville for July 28 and ...

Jacksonville, North, Northeast Florida: Dangerous heat today, with heat index of 108 to 115. Extreme heat warning and heat ...

Tampa reached another milestone on Tuesday afternoon, reaching an all-time record heat index of 119° at around 2:30 p.m.

The National Weather Service has issued a three-day heat advisory affecting nearly every county in the state through ...

How is the heat index calculated, and why is it more important than the air temperature during some heat waves?

At 12:11 a.m. on Tuesday, the National Weather Service issued an extreme heat warning valid between 11 a.m. and 9 p.m. for ...