The first week of meteorological spring will start out with some sunshine, but clouds and more widespread rain potential will fill in over the course of the week. We will not see much cloud cover Sunday night into Monday morning, allowing temperatures to quickly warm from the low 20s to the mid-40s by Monday afternoon. Thicker clouds filter in by evening ahead of the first of several weather systems.
We will remain dry through about 12AM-3AM Tuesday morning, but isolated and light rain will begin to develop before daybreak Tuesday. Initially, there may still be just enough cold air in place to cause a few patches of freezing rain, but this will quickly flip over to just liquid rain by morning.
Coverage of showers will be a bit higher late Tuesday morning into the afternoon, with a few pockets of steadier rain. There will be several dry hours Tuesday afternoon and evening, but it will remain damp with some spotty drizzle mixed in. Temperatures will struggle to reach as warm as they were Monday considering the added cloud cover and spotty rain.
More widespread potential for rain arrives Wednesday and again Friday with stronger passing waves overhead. Each of these could bring some pockets of steady to heavy rain with a few embedded rumbles of thunder. Some drier windows between systems will be centered around Wednesday morning and Thursday afternoon. In total through Saturday morning, rainfall may amount to around an inch for most in Northern Illinois. There may be a sharp cutoff with under a half inch for some in Wisconsin and the most abundant rain remaining across Central Illinois. Temperatures will continue to rise, particularly with Friday's passing system bringing afternoon highs up near 60°!
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