* WHAT...Heat index values up to 105 expected.
* WHERE...Portions of southwest and west central Iowa and east central, northeast, and southeast Nebraska.
* WHEN...From 1 PM Sunday to 9 PM CDT Tuesday.
* IMPACTS...Hot temperatures and high humidity may cause heat illnesses.
* ADDITIONAL DETAILS...Overnight heat indices in the mid-70s and lower-80s will make it difficult for homes without air conditioning to cool down. Hot weather is expected to persist through the week.