Weather systems are sweeping across the United States, putting millions at risk of potentially hazardous travel.

Lake Effect Snow warning issued for Southern Erie and Crawford Counties with heavy snow, strong winds, and whiteout conditions expected. Travel disruptions and safety precautions are stated by the National Weather Service.

The National Weather Service issued a Winter Storm Warning forecasting extreme snowfall totals and powerful winds that could make conditions dangerous. Sierra Nevada faces 4-8 feet of snow and 60 mph winds from December 23-26. “Dangerous travel ...

Portions of Florida and the broader Southeast are facing a cold snap, with freeze warnings and watches issued.

A freeze warning is in effect for parts of northern Florida and southern Georgia. A freeze warning means temperatures are forecast to fall below 32 degrees for an extended period. Chilly holiday weather will arrive early for some Floridians tonight.

Mike Darnay is a digital producer and photojournalist at CBS Pittsburgh. Mike has also written and produced content for Vox Media and the Mon Valley Independent. He often covers overnight breaking news, the Pittsburgh Steelers and high school sports.

Cold weather advisories and freeze watches and warnings are popping up in Florida as a cold front starts to move through the state.

Florida's rare freeze warnings affect millions of residents and potentially vulnerable populations unaccustomed to the conditions.