The combination of temperatures in the low 90s and high relative humidity will lead to peak heat indices around or slightly above 100 degrees this afternoon. A few spots could approach brief heat indices near 105 degrees. Take it easy today by staying in air conditioning as much as possible. Never leave children or pets unattended in vehicles.

* WHAT. Heat index values up to 107 expected. * WHERE. In Indiana, Jefferson County. In Kentucky, Trimble and Henry Counties. * WHEN. From 1 PM EDT /noon CDT/ to 8 PM EDT /7 PM CDT/ today. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur.

Hot and humid conditions are expected to be greatest on Wednesday afternoon across southern central Indiana. High temperatures in the low 90s with heat index values at least briefly in excess of 100 degrees may be hazardous for sensitive and vulnerable populations. Take extra precautions if spending extended time outside during the afternoon today.

* WHAT. Heat index values between 100 and 104. * WHERE. Portions of east central and southeast Indiana, northeast and northern Kentucky, and central, south central, southwest, and west central Ohio. * WHEN. From noon today to 8 PM EDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.