A strong warm front in central Illinois will be pulled north Monday night. Highs Monday reached the upper 40's and low 50's making it feel very spring-like.
As the warm front moves closer, light rain showers will develop and continue into the overnight. Weak instability following the front and moving in with an area of low pressure could be just enough to produce a few isolated thunderstorms. If any storms were to develop most of them would be elevated which would pose a small hail threat, mainly south of the immediate Stateline.
A very moisture rich atmosphere will be in place Tuesday morning holding temperatures in the low 40's. Low pressure passes late Tuesday morning with a cold front following late in the day. Colder air arrives by Tuesday night pushing temperatures from the mid-40's in the afternoon down into the low 20's by Tuesday night.
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