Illinois is experiencing unseasonably warm weather, with temperatures soaring to 85°F (29°C), significantly above typical April averages. This warm spell, coupled with increased humidity, has created conditions ripe for thunderstorm development. The National Weather Service has issued advisories indicating a moderate chance of thunderstorms, particularly during late afternoon and evening hours. These storms are expected to bring heavy rainfall, gusty winds, and occasional lightning, potentially disrupting outdoor activities and travel plans.