...A Heat Advisory will be in effect for the Four State Region from noon today through 8 PM CDT Friday... .The combination of hot afternoon temperatures and high relative humidity values will result in heat index values between 105 and 110 degrees Thursday afternoon and evening and Friday afternoon and evening. ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM CDT FRIDAY... * EVENT...Hot temperatures from the upper 90s to around 104 degrees and high relativity values will result in maximum heat indices between 105 and 110 degrees. * TIMING...Between noon and 7 PM CDT today and noon to 8 PM CDT Friday. The heat advisory will most likely be extended through the weekend since hot temperatures near 100 degrees will continue and high relative humidity values will be favorable for maximum heat indices between 105-110 degrees. * IMPACT...Heat related illnesses will be possible for those involved in outdoor activities and home bound persons without air conditioning or circulated air.