The chart is a grid where you can find the heat index temperature by looking at the air temperature and relative humidity. For example, the NWS says if it's 96 outside and the humidity is 65%, the ...

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

The heat index chart that the National Weather Service uses measures what temperatures will feel like in the shade. In direct sunlight, the agency warns heat index values can increase by up to 15 ...

A public health researcher explains the signs someone is developing heat exhaustion or heat stroke, and what to do.

When you hear the term “heat index” in the forecast, it’s usually paired with a much higher number than the actual ...

The National Weather Service provides a heat index chart and calculator to determine local apparent temperatures. With an early summer heat wave baking Michigan and the Midwest, ...