Prepare for fog in Southeast Pa. until Saturday morning

A report was issued from the National Weather Service on Saturday at 4:17 a.m. for fog until 9 a.m. for Western Chester, Eastern Chester, Western Montgomery and Eastern Montgomery as well as Delaware, Philadelphia and Bucks counties.

"Areas of patchy fog have continued to expand into portions of Delaware, northern New Jersey, and southeast Pennsylvania early this morning. Temperatures are also below freezing, which may result in areas of freezing fog. In addition, any snowmelt from Friday could result in the formation of black ice. Use caution if traveling this morning as patchy fog can result in unexpected reduced visibilities and black ice can make conditions very slippery. Slow down, use your low beam lights, and leave extra room between you and other vehicles," states the weather service.