The first winter storm of the season has left North Texas, but cold temperatures have frozen the water and slush that remained on the ground. TxDOT and cities have been working to clear ice from the roads, but there are still dangerous road conditions.

Black ice is a thin layer that forms on surfaces such as roads, sidewalks and driveways when temperatures are 30 degrees or lower.

Tony Hartzel, a Dallas district spokesperson for the Texas Department of Transportation, said the roads in the Dallas area are still fairly passable – but that there could be hotspots.

This week's North Texas snow event will end with a few flurries during Friday's morning commute, leading to hazardous road conditions.

The winter storm warning in effect for North Texas has been downgraded to a winter weather advisory, according to the National Weather Service Fort Worth. Temperatures in the Fort Worth area remain around freezing, and the precipitation could cause a small amount of ice to accumulate bridges and overpasses.

WFAA has all the information you need to make decisions about everything from your commute to where to find the best sledding spots in DFW.

CBS News Texas meteorologist Jeff Ray reports that the winter event will persist, with temperatures dropping below freezing overnight, leading to refreezing and potential ice formation on North Texas roads.

North Texas experienced snow, slush, and rain on Thursday. More snow is expected, tapering off by early Friday morning. Roads will improve as temperatures rise Friday afternoon. Travelers should avoid roads due to icy conditions.