Dense Fog is developing across southeastern Iowa early this morning. A Dense Fog advisory has been issued until 10am this morning for many counties in the southeastern part of the state. (Mainly south of US Highway 30 and east of US Highway 63) Visibilities have been reduced to under 1/4 of a mile in many areas. Dewpoints have also come up into the 50s statewide, which will be adequate enough for thunderstorm intitation later this afternoon and tonight.