* WHAT...Heat index values up to around 100 degrees.
* WHERE...Butler, Cerro Gordo, Franklin, Hancock, Worth, Wright, and Bremer Counties.
* WHEN...Until 10 PM CDT Wednesday.
* IMPACTS...Hot temperatures and high humidity may cause heat illnesses.
* ADDITIONAL DETAILS...The Extreme Heat Warning has been converted to a Heat Advisory for the affected counties given recent trends in lowering temperatures in these areas due to lingering clouds and the possibility of lingering morning showers and thunderstorms.