Dense Fog Advisory issued August 4 at 6:23AM EDT until August 4 at 9:00AM EDT by NWS Pittsburgh PA

* WHAT...
Visibility one quarter mile or less in dense fog.

* WHERE...
Portions of east central Ohio, western Pennsylvania, and northern and the northern panhandle of West Virginia.

* WHEN...
Until 9 AM EDT this morning.

* IMPACTS...
Low visibility could make driving conditions hazardous.

* ADDITIONAL DETAILS...
Satellite imagery, web cams and surface observations show that dense fog has become more widespread across the region early this morning. Visibilities will be worst in river valleys, as well as areas south of I-70, and across northwest Pennsylvania. Rapid changes in visibility are expected, which will also lead to hazardous driving conditions. Visibilities are expected to quickly improve after 9 PM.

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