Those were not just Chicago storms. They were subforum storms in the same general region, just Chicago did excellent in both. This would absolutely fit to have a moniker of GHDII. I believe Chicago got 20" in 1 and 18" into. Detroit got 10" in GHDI and almost 17" in GHDII.
FEB 1/2, 2011
FEB 1/2, 2015
FEB 2/3, 2022