3km NAM looks to be way under-doing surface temps compared to the Euro. It looks like it has extensive cloud cover that limits heating throughout the day, and resulting in a stout EML above the cooler surface temps. The Euro has been advertising a much more mixed, warmer surface regime for many days, and results in surface temps 10+ degrees warmer. It continues to insist on convection taking off later Tue afternoon over northern IL, in a fairly impressive thermodynamic environment. It will be interesting to see which model wins out.