We went behind the scenes Columbia National Weather Service office to see what goes into tracking winter storm, 24 hours before potentially massive snow hits.

The National Weather Service (NWS) is advising up to 200 million people across the U.S. to not travel unless they absolutely have to leave their homes, following a round of winter storm warnings issued for more than 30 states for Friday,

Extreme cold weather watch issued for Southwest Florida with possible snow flurries.

The National Weather Service issues a litany of notices before and during inclement weather events. They can be important signals on how to respond.

Over the weekend, a powerful winter storm is set to impact more than 130 million people across the United States as heavy winter precipitation, strong winds, and bitterly cold temperatures move in, bringing dangerous conditions.

Advisory in effect from 7 p.m. Saturday to 10 a.m. Sunday

Wireless Emergency Alerts are sent by the National Weather Service and distributed by your mobile provider. WEA service is free and there's no signup required but you won't get an alert if the function has been disabled on your phone. Have a NOAA radio?

There's more than a 50% chance Nashville will be significantly impacted by ice, making travel extremely dangerous.

Temperatures in Chicago haven’t been above freezing for 10 days, but the National Weather Service said there’s light at the end of this frigid tunnel. Chicagoans will still have to endure several more days of bitter cold before temperatures begin trending upward. Expect a gradual warm-up — relatively speaking — by the weekend.

Seattle faces a rainy week with high chances of precipitation and moderate temperatures, as per the National Weather Service.