A Dense Fog Advisory is in effect for most of southeast PA and northern NJ until 1 am, according to the National Weather Service.
Visibility may be restricted to near zero in some spots which can lead to hazardous driving conditions.
Rain should help improve visibility, according to the NWS.
If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Rain will move into the region tonight and will continue through at least Thursday. Any lingering snowpack should melt off and wash away, but flooding is not expected.
