Dense Fog Advisory

* WHAT...For the Dense Fog Advisory, visibility one quarter mile or less in dense fog. For the Heat Advisory, heat index values up to 102 expected.

* WHERE...Codington, Deuel, Grant, Hamlin, and Roberts Counties.

* WHEN...For the Dense Fog Advisory, until 9 AM CDT this morning. For the Heat Advisory, from noon today to 8 PM CDT this evening.

* IMPACTS...Hot temperatures and high humidity may cause heat illnesses. Low visibility could make driving conditions hazardous.