Widespread heavy snow and a damaging ice storm are on the table from the South into the Midwest and Northeast, including a potential nor'easter. Here’s the very latest forecast.

Pancake ice forms when frigid air and rough water turn slushy ice into round, floating disks, signaling cold, turbulent winter conditions.

Winter Storm Fern will bring significant icing and heavy snow to the Deep South starting Friday night and continuing all weekend long. All precipitation types will be possible, as rain will change over to freezing rain, sleet and then eventually snow from north to south. Minor ice accumulations will be possible in Houston, Austin and San Antonio with higher and more damaging ice accretion likely in Dallas, Fort Worth, Shreveport, Greenville and Tupelo. This will be a long-duration event, so tree damage and power outages are likely and travel will become difficult to impossible this weekend, so adjust travel plans and have a winter emergency kit in your car just in case. Click here for your latest snow and ice forecasts.

Crews are spreading salt on roads, and people are stocking up on food and other supplies as a winter swarm threatens a huge swath of the country.

Winter Storm Fern will bring heavy snow and a wintry mix to millions across the Northeast, mid-Atlantic and Ohio Valley Saturday night into Sunday. The rain/ice line continues to shift so now the I-95 corridor has potential to see heavy snow, followed by sleet or freezing rain. Either way, this is going to be a major snow storm with the potential for at least a foot of snow along the I-95 corridor. Travel will become difficult to impossible, so adjust plans now and be sure to have a winter emergency kit in your car just in case. Watch this video to see how the forecast has changed.