(KMAland) — The National Weather Service has issued a dense fog advisory for parts of southwest Iowa, southeast Nebraska and northwest Missouri. Harrison-Shelby-Pottawattamie-Mills-Montgomery-Fremont-Page. Nebraska. Douglas-Sarpy-Cass-Otoe-Johnson-Nemaha-Richardson. * WHAT…Visibility one quarter mile or less in dense fog. * WHERE…Portions of southwest and west central Iowa and east central, northeast, and southeast Nebraska.