Like the 00z run, the 06z run of the Euro also whiffs northern IL tonight. However, now that the Euro has left the accumulation party, the HRRR has jumped on board. The 12z run drops some light accumulations for most of northern IL, including Chicago. The NAMs continue to remain dry over the area throughout the night.
It comes down to the timing of the development of the precipitation. The models that are dry for northern IL are just delaying the eventual development of the wave of precip and still drops precip on lower MI. Gonna have to watch the ol' radar later tonight to see what actually happens. Looks like if it's gonna snow in Chicago it would be in 6h window between about 2am and 8am, so if we can keep precip from developing until near the end of that window they could remain snowless.