* WHAT...Visibility under a quarter mile at times in dense fog.
* WHERE...Southwest and south central North Dakota, west of the Missouri River.
* WHEN...Until 10 AM CDT /9 AM MDT/ this morning.
* IMPACTS...Low visibility could make driving conditions hazardous.
* ADDITIONAL DETAILS...This includes the I-94 corridor from Beach to Mandan and the Highway 85 corridor from Fairfield to Bowman.