Heat Advisory

* WHAT...Heat index values up to 104 expected.

* WHERE...Cedar and Knox Counties.

* WHEN...From 1 PM to 9 PM CDT Sunday.

* IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

* ADDITIONAL DETAILS...Overnight heat indices in the mid-70s will prevent uncooled homes from easily dispersing the day's heat. Hot temperatures are expected to linger through the week.