* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...In Nebraska, Cheyenne County and Kimball County. In Wyoming, Converse County Lower Elevations, Niobrara County, Central Laramie County, East Laramie County, East Platte County, and Goshen County.
* WHEN...Until 9 AM MST Sunday.
* IMPACTS...Low visibility could make driving conditions hazardous.