Pennsylvania – Headlights blur into halos this morning as dense fog settles over highways, neighborhoods, and river crossings, muting the skyline and slowing the start of the day. Damp air clings to roadways, visibility drops fast, and even familiar routes feel uncertain during the early commute.
According to the National Weather Service office in Mount Holly, a Dense Fog Advisory remains in effect through mid-morning. Visibility ranges from one quarter to one half mile across southeastern Pennsylvania, including Philadelphia and surrounding suburbs. Officials warn conditions can change quickly, especially near rivers, low-lying roads, and major corridors like I-95 and the Schuylkill Expressway.
Fog gradually lifts later today, giving way to partial sunshine and unseasonably mild air. Highs climb into the low 50s, helping roads dry but leaving behind lingering moisture. West winds increase through the afternoon, occasionally gusty, which may help scour out remaining low clouds.
Thursday brings calmer conditions and brighter skies, offering a short break before the pattern turns active again. By Friday, rain chances rise as a developing system spreads showers across the region. Wet pavement returns, and travel impacts increase during busier daytime hours.
Looking into the weekend, rain becomes more likely and heavier at times. While temperatures stay mild, winter risks remain. After all, January sun melts moisture by day, then colder nights set the stage for flash freezing on untreated roads and sidewalks.
Slow down this morning and leave extra distance if driving. Plan flexibility into Friday travel. Meteorologists continue monitoring broader winter systems, and additional Weather Alerts are possible.
Five-Day Outlook for Philadelphia, Pennsylvania
- Today: Dense fog early, then partly sunny, high near 52
- Tonight: Partly cloudy, low near 34
- Thursday: Mostly sunny, high near 50
- Friday: Periods of showers, high near 57
- Saturday: Showers likely, high near 61
