 As sections of western and south Illinois triple-digit readings into Kansas yesterday will expand. That 100-degree heat is close in as St. Louis and the Mississippi Valley, mid-Mississippi Valley for the day-to-day with 100-degree readings southward into Texas with oppressive humidity. Air dries out a little bit back across the western states, including California, but not enough to bring an end to showers and thunderstorms. The wet season, the monsoon season is underway.