A tropical wave in the forecast is not a reason to panic — but it’s not something to ignore, either. What it is and its odds of forming.

Winds blowing over the Appalachian Mountains on Wednesday created a dazzling display of gravity waves in the nearby clouds. The phenomenon is a spectacular example of how terrain can influence the ...

Looking up at the sky might seem like a simple pastime, but for those who know what to watch for, clouds tell stories that could save your life. Most of us walk around barely noticing the atmosphere ...