PENNSYLVANIA — A Dense Fog Advisory has been issued for portions of southeastern Pennsylvania, with visibility expected to drop to as low as one-quarter mile overnight into Wednesday morning, according to the National Weather Service.
The advisory, issued at 1:15 p.m. Tuesday, is in effect from 10 p.m. Tuesday through 10 a.m. Wednesday, Feb. 18, 2026. Forecasters say visibility could range between one-quarter and one-half mile in areas of dense fog.
In Pennsylvania, the advisory includes Carbon, Monroe, Berks, Lehigh, Northampton, Delaware and Philadelphia counties, along with western and eastern portions of Chester, Montgomery and Bucks counties. Cities affected include Reading, Allentown, Bethlehem, Easton, Jim Thorpe, Stroudsburg, West Chester, Kennett Square, Norristown, Lansdale, Doylestown, Perkasie, Chalfont, Pottstown, Media and Philadelphia.
Low visibility during the early morning hours could create hazardous driving conditions, particularly along rural roads, highways and in areas near rivers and low-lying terrain where fog tends to be thicker.
Because the advisory extends through 10 a.m., conditions could directly impact the morning commute, including school bus routes. Limited visibility can make it difficult for bus drivers to see other vehicles, pedestrians and stopped traffic. In past fog events, some school districts in southeastern Pennsylvania have opted for two-hour delays or full-day closures when visibility was slow to improve.
If dense fog lingers into mid-morning, multiple school districts across the affected counties could consider delays or cancellations for Wednesday to ensure student safety. Parents and guardians are encouraged to monitor announcements from their local school districts.
Drivers are advised to slow down, use headlights and leave extra distance between vehicles while traveling in foggy conditions.
