* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...Portions of north central Kansas and central and south central Nebraska.
* WHEN...Until 10 AM CST this morning.
* IMPACTS...Widespread dense fog will make for difficult driving conditions across the advised area Friday morning.
* ADDITIONAL DETAILS...Temperatures approaching and dropping below freezing during the early morning hours could make for slick roadways in areas of freezing fog.