These types of events are not a dense cloud of plasma like a CME, they are basically just push brooms that gather things in front of them. You can see this if you look at the graphs... a pronounced spike in density, followed by an increase in the IMF, and then you get into the high speed wind stream. Once you're into that stream (like we are now), the Bt falls to background levels and so even with a 100% south Bz, it's over.
This one was pretty good... off the charts density, the Bt peaked near 40 and Bz dipped to -25. That would have been pretty epic BUT it wasn't sustained. Not much will happen when the IMF graph looks like the EKG of a hummingbird.