...HEAT AND HUMIDITY TO INCREASE THURSDAY AND FRIDAY... Temperatures over the next few days will become hotter as a ridge of high pressure aloft expands over the area. An Excessive Heat Warning may be needed for portions of the area Thursday and Friday. ...HEAT ADVISORY REMAINS IN EFFECT FROM NOON TO 9 PM CDT THURSDAY... ...HEAT ADVISORY REMAINS IN EFFECT FROM NOON TO 9 PM CDT FRIDAY... * HEAT INDEX VALUES...105 to 115 degrees both Thursday and Friday afternoons. * Impacts...The combination of hot temperatures and high humidity will create a dangerous situation in which heat illnesses are possible.