Snow is going to develop right overhead of Lower Michigan this morning. There will be steady snow eventually and widespread accumulations of a few inches. The winter weather advisory map below nicely shows where snow-covered and slick roads will develop.

On Friday at 9:08 p.m. the National Weather Service issued a winter weather advisory in effect until Sunday at 1 a.m. for Mercer, Venango, Forest, Lawrence, Butler, Clarion, Jefferson, Armstrong and Indiana counties.