...A Heat Advisory remains in effect for the entire Four State Region through 7 PM CDT Monday... ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT MONDAY... * EVENT...An upper level heat ridge will continue building east into the region through Monday, resulting in afternoon temperatures again climbing into the mid 90s to near 100 degrees. Southerly winds will maintain the high humidity through Monday, with resultant heat indices ranging from 105 to 110 degrees. Limited relief from the heat is expected tonight, with low temperatures only falling briefly into the mid and upper 70s. * TIMING...Through 7 pm CDT Monday. * IMPACT...High heat index readings will increase the risk of heat-related illnesses.