Moderate

Areas of fog, dense in some locations will persist through sunrise. The dense fog will be especially common in river valleys and other low lying areas, and in areas that received rainfall yesterday. Visibilities in the fog will be reduced to one quarter mile or less at times. If traveling early this morning, be prepared for fog that could bring sudden and significant reductions in visibility over short distances. If you encounter dense fog, slow down, give yourself

* WHAT...Heat index values up to 110 expected. * WHERE...Portions of southeast Georgia and southeast South Carolina. * WHEN...From 11 AM this morning to 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and

* WHAT...Visibility down to one-quarter mile in dense fog. * WHERE...Ellsworth, Lincoln, Russell, and Saline Counties. * WHEN...Until 10 AM CDT this morning. * IMPACTS...Low visibility could make driving conditions hazardous. If driving, slow down, use your headlights, and leave plenty of distance ahead of you.

* WHAT...Heat index values up to 110 expected. * WHERE...Portions of south central and southeast Texas. * WHEN...From noon today to 7 PM CDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...This advisory may need to be extended into the weekend. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Garfield, Holt, and Wheeler Counties. * WHEN...Until 10 AM CDT this morning. * IMPACTS...Low visibility could make driving conditions hazardous. If driving, slow down, use your headlights, and leave plenty of distance ahead of you.

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Custer, Loup, and Lincoln Counties. * WHEN...Until 10 AM CDT this morning. * IMPACTS...Low visibility could make driving conditions hazardous. If driving, slow down, use your headlights, and leave plenty of distance ahead of you.

* WHAT...Visibility less than one mile in dense fog. * WHERE...Portions of north central Kansas and central, east central, and south central Nebraska. * WHEN...Until 10 AM CDT this morning. * IMPACTS...Low visibility could make driving conditions hazardous. If driving, slow down, use your headlights, and leave plenty of distance ahead of you.

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Dawson County. * WHEN...Until 10 AM CDT this morning. * IMPACTS...Low visibility could make driving conditions hazardous. If driving, slow down, use your headlights, and leave plenty of distance ahead of you.

* WHAT...Heat index values up to 112 expected. * WHERE...Portions of south central and southwest Alabama, northwest Florida, and southeast Mississippi. * WHEN...From 11 AM this morning to 8 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose

Patchy dense fog has developed early this morning. Most locations may just experience low overcast, but isolated locations and a handful of observations have reported visibility as low as a quarter of a mile. Gradual improvement is expected through 9 or 10 AM. If driving, slow down and leave extra distance ahead of you in case a sudden stop is needed.