The overnight ice and the new accumulating snow Friday morning caused slippery road conditions around the Willamette Valley.

Originally a celebration of President George Washington’s birthday, in 1968 the holiday was adapted to also honor the birth of U.S. President Abraham Lincoln and moved to the third Monday in February.

Severe cold and icy conditions are impacting public transportation in the Portland area, prompting TriMet to urge caution for those who must travel.