Heat Advisory

* WHAT...Heat index values up to 105 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 make it difficult for homes without air conditioning to cool down. Hot weather is expected to persist through the week.