Holiday travelers heading North for the Christmas holiday on Saturday should prepare for some very severe weather and hazardous traveling conditions.

A winter storm started barreling down on the Northeast Friday night, blanketing parts of New England with a mixture of snow, sleet, and freezing rain.

As of Friday night, there were winter storm warnings in place in upstate New York and northern New England. Several inches of snow had already fallen in the mountainous parts of New York, Vermont and New Hampshire, and the storm was expected to continue through Saturday.

If you are determined to get North for the Christmas holiday, be aware that conditions are worse the further North and West you go into New England and New York state.

By Saturday night, forecasters said six inches of snow will have fallen over much of New England and upstate New York. But they also said sleet and freezing rain may hit the area Saturday, creating very dicey driving conditions.

The National Weather service reported “significant” risk of freezing rain, icy and slippery conditions, and hazardous travel throughout much of New England, except southeast Massachusetts.

“A Winter Storm Warning means significant amounts of snow, sleet and ice are occurring,” the National Weather Service in Burlington, VT said. “This will make travel very hazardous or impossible. Please allow extra time if travel is necessary.”

Along the I-95 corridor, drivers should expect conditions to worsen as they pass through Boston and head North on Saturday. Further west into Vermont, the National Weather service predicted as much as a foot of snow in some areas, as well as three-tenths of an inch of ice in some parts of the state.