Many people recognize fog as a low-lying cloud, but how does it form? Fog develops when the air near the ground becomes saturated or cool enough for moisture to condense. This occurs when the ...

Astronomical autumn began around September 23, when the sun was directly above the Equator before appearing to move ...

It's a T-shirt kind of day in Washington, DC: 85 degrees with 63 percent humidity. We all know those numbers mean hot, but what exactly does that humidity percentage tell us? And why should we care?

NORFOLK, Va. — Most summer days, you hear us talk about “humidity” when describing how the air feels. While many people are familiar with the term relative humidity — the percentage of water vapor in ...