* WHAT…Visibility less than one mile in dense fog. * WHERE…West central Minnesota including Wadena, Hubbard, East Becker, Mahnomen, South Clearwater, West Becker, East Otter Tail, Grant, and West Otter Tail Counties. * WHEN…From 3 AM to 9 AM CST Monday. * IMPACTS…Low visibility could make driving conditions hazardous.