The heat index, also known as the apparent temperature, is what the temperature feels like to the human body when relative humidity is combined with the air temperature.

Sometimes the temperature outside feels warmer than it is, and there's a reason. Here's a breakdown of the heat index.

Sometimes the temperature outside feels warmer than it is, and there's a reason. Here's a breakdown of the heat index.

An 'extreme heat watch' is in effect as the heat index is expected to skyrocket. Here's timing, updated heat index values, more.

Proactive management of livestock prior to and during heat events is critical in protecting livestock from heat stress.

It's because of something called the heat index. The heat index measures what the air temperature combined with the level of humidity feels like to the human body, the National Weather Service says.

Summer is near in Philly and so is the first heat wave. Here's what you need to know about the incoming 'heat dome', from timing to the heat index.

Basically, when the body sweats, the perspiration evaporates, cooling the body. When the humidity is high, the sweat doesn't evaporate as quickly and the body doesn't cool itself as well. Therefore, ...

Take action when you see symptoms of heat exhaustion and heat stroke.

The heat index is what the temperature feels like to the human body when relative ... Extreme danger: When the heat index is 125 degrees or higher, heat stroke is likely. Here's a chart to help you ...