Heat Advisory

* WHAT...Heat index values up to 102.

* WHERE...Harrison and Monona Counties.

* WHEN...Until 9 PM CDT Tuesday.

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

* ADDITIONAL DETAILS...Overnight heat indices in the mid-70s to lower-80s will make it difficult for homes without air conditioning to cool down. Hot weather is expected to persist through the week.