April 7-10 Severe Weather Outbreak Series: 4-8 Day SPC Map (April 6)

There have been some timing differences through the GFS and ECMWF models. However, the 0z runs proved they were working towards a compromise. The difference is now 6 hours, with a good meeting point and overall fairly well understanding of the storms track.
NOGAPS model has the squall line into Chicago IL in the early morning.
GEM model is potentially the slowest.
All the models have a good understanding of where the low will go, but timing is in all different directions.