Dense Fog Advisory Delaware, New Jersey, Pennsylvania | Effective 03/21/2026 02:29

Headline: 
Dense Fog Advisory issued March 21 at 5:29AM EDT until March 21 at 8:00AM EDT by NWS Mount Holly NJ
Event: 
Dense Fog Advisory
Urgency: 
Expected
Effective: 
March 21, 2026 - 2:29am
Expires: 
March 21, 2026 - 5:00am
Description: 
* WHAT...Visibility as low as one quarter mile in dense fog. * WHERE...In Delaware, New Castle County. In New Jersey, Mercer, Middlesex, Camden, Gloucester, Northwestern Burlington, and Salem Counties. In Pennsylvania, Delaware and Philadelphia Counties. * WHEN...Until 8 AM EDT this morning. * IMPACTS...Low visibility could make driving conditions hazardous.
Instruction: 
If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Area Description: 
New Castle; Middlesex; Mercer; Salem; Gloucester; Camden; Northwestern Burlington; Delaware; Philadelphia
Forcast Office: 
NWS Mount Holly NJ