Fog that never really went away today in the northern and northeastern counties of the state will be returning statewide tonight through tomorrow morning as more snow has continued to melt over the area. The National Weather Service has issued Dense Fog Advisories through Thursday morning and afternoon for almost the entire state of Iowa except the southeastern counties of the state. Visibilities could be reduced to near 0 in some places and will stay this way through the morning hours of Thursday. Where the fog burns off the fastest will be the locations that could touch the 60 degree mark tomorrow.