Heat Advisory

* WHAT...For the Extreme Heat Warning, dangerously hot conditions with heat index values up to 114. For the Heat Advisory, heat index values up to 108 expected.

* WHERE...Collin, Dallas, Denton, Hunt, Kaufman, Rockwall, Tarrant, Rains, and Van Zandt Counties.

* WHEN...For the Extreme Heat Warning, until 8 PM CDT Wednesday. For the Heat Advisory, from 8 PM Wednesday to 8 PM CDT Thursday.

* IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity will increase the risk for heat-related illnesses to occur, particularly for those working or participating in outdoor activities.