Extreme Heat Watch

* WHAT...For the Dense Fog Advisory, visibility one quarter or less in dense fog. For the Extreme Heat Warning, dangerously hot conditions with heat index values near or exceeding 110 expected. For the Extreme Heat Watch, dangerously hot conditions with heat index values up to 110 possible.

* WHERE...Jasper, Appanoose, Clarke, Decatur, Lucas, Marion, Monroe, and Wayne Counties.

* WHEN...For the Dense Fog Advisory, until 9 AM CDT this morning. For the Extreme Heat Warning, from noon to 9 PM CDT Sunday. For the Extreme Heat Watch, from Sunday evening through Monday evening.

* IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Low visibility could make driving conditions hazardous.