The ongoing storm is producing low-latitude auroras in the southern hemisphere. Ken James sends this picture from the Snake Valley Observatory in Victoria, Australia:
Readers in the USA should note that the southern latitude of Victoria, Australia, 37 degrees, is the same as the northern latitude of central California. That's how far down auroras could be seen if it were dark instead of daylight in North America.
Why is this storm so severe? Take a look at the solar wind data from NOAA's DSCOVR spacecraft:
https://spaceweather.com/