Extreme levels of heat and humidity are forecast to spread across the country over the next two weeks, blanketing the Southwest, Midwest, and East Coast with high temperatures beginning this June 19 ...

Summer is here, and heat and humidity have arrived.

The temperature on any given summer day may be in the 80s or 90s. So why does it feel so much hotter and oppressive at times? That's the heat index doing its thing. Here's how it works: What is the ...

ROCHESTER, N.Y. – This time of the year it is especially important that we effectively communicate the amount of moisture in the atmosphere on any given day. There are different ways of doing this, ...

Michigan's heat wave this week will feel even warmer because of high humidity. Here's how the heat index works.

The heat index shows how humidity makes hot days feel hotter, and why direct sun can push dangerous conditions even higher.