National Weather Service United States Department of Commerce

Scattered showers over northern IL this mid-afternoon will continue to move east with additional development expected. A storm or two possible. Higher likelihood of storm development in IA/NW IL into early eve, and this will move east into the area after dark.
Showers and thunderstorms are expected tonight. While the severe weather threat is low, some storms could produce small hail and gusty winds, in addition to locally heavy rainfall.
Showers and thunderstorm will be possible very late Tuesday afternoon and into the overnight hours. Whether storms can manage to develop in the first place remains in question, but if they do develop, they would become severe with a threat for large hail and damaging winds. If the "cap" is weaker than currently forecast, then severe weather would become a greater threat.
Showers and storms are expected tonight. While severe weather chances are low, some storms could produce small hail and gusty winds with locally heavy rain. Whether additional storms develop Tuesday afternoon and evening remains in question, but if they do form, they would become severe with a threat for large hail and damaging winds. Cooler and breezy conditions to close out the week.