An unpredictable Nor'easter is tracking up the East Coast, and its outer bands will make travel tricky for Butler County commuters Monday.

The National Weather Service has extended the winter weather advisory for the Butler County area until 6 a.m. Tuesday.

Winter storm Orlena is expected to slam the East Coast with her snow bands, heavy at times, wheeling through western Pennysvania.

The storm is expected to dump 2 to 6 inches of snow in parts of Butler County through early Tuesday.

Snow is expected to be heaviest to the south and east.