Authorities report snow and icy conditions on northern Arizona highways as a storm system sweeps across the region.
The National Weather Service says a cold front is causing snow showers and that snow levels will reach down to valley floors.
A winter weather advisory issued for the Flagstaff area says new snowfall between 3 a.m. and 8 p.m. Friday in Flagstaff and Williams may reach up to 4 inches (10 centimeters).
The state Department of Transportation advised travelers headed to the Grand Canyon to allow plenty of extra travel time because of snow and limited visibility.
