This index, from NOAA's National Weather Service, attempts to scale the impacts from winter weather, taking into account factors such as snowfall, accumulated snow on rooftops, ice accumulation, the potential for a flash freeze, and blowing snow. Not all factors are in play in a given winter storm.

With a winter storm set to hit the New York City area — along with nearly half of the United States — this weekend, the timing, along with potential snow accumulation and travel impacts, are top of mind.

Track the major winter storm that will stretch over 2,000 miles and impact 30 plus states throughout the nation. Stay with FOX Weather for live radar and 24/7 updated weather maps on the latest conditions,

The winter storm pushing into Michigan today is part of a massive system that has sparked storm warnings and weather advisories across a nearly 1,500-mile swath of the United States. Radar and the National Weather Service storm warnings and advisories map ...

With a winter storm set to hit the New York City area — along with nearly half of the United States — over the weekend, we’re getting a clearer picture on the timing of when we could see snow start to fall,

Track everything from current conditions, forecast timing and potential impacts from the winter storm here.