* WHAT...Heat index values of 105 to 110 expected. * WHERE...Gage, Jefferson, Johnson, Lancaster, Pawnee, Saline, and Seward Counties. * WHEN...From 10 AM to 10 PM CDT Monday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Overnight heat index values in the mid to upper 70s will provide little relief.