The National Weather Service defines hoar frost as "a deposit of interlocking crystals formed by direct sublimation on ...

Vigilance and preparation are important, say forecasters at the NWS, as wintery weather brings hazardous travel conditions.

Around 20 million people were under winter weather alerts across parts of the mid-Atlantic and New England, including ...

Here's a look at how the Northwest Avalanche Center's team of forecasters determines the daily risk of avalanches in Washington's Cascades.

As Americans are setting off on holiday trips this week, they may be facing dangerous winter weather in the Northeast that ...

Over 10 million people across the Northeast and Great Lakes are under winter weather alerts, with icy conditions and snowfall ...

More than 119 million people are expected to travel for Christmas and Hanukkah, which both fall on the same day this year, ...

Most of the United States will see a dry holiday with above-average temperatures this year, while some mountain regions might ...

At least 17 states experienced some level of snowfall in the last 24 hours, National Weather Service data shows.