-High latitude power issues
-Transformer damage from prolonged storms
-Spacecraft orbit issues
-Auroras seen as far south as New York and Idaho
This geomagnetic storm is expected to continue for a little while longer.
The K index does something more than tell the strength of a geomagnetic storm. It can also tell how far south the Aurora Borealis, or Northern Lights, may extend. Let's take a look.
Using the observed K index, as well as observed data from the ACE spacecraft roughly 1 million miles from Earth, I would expect the aurora borealis to extend to the 5 line shown above, with the potential of sightings of the Northern Lights in areas just to the south of that 5 line. I would not count aurora sightings in extreme southern Wisconsin/northern Illinois out this evening, although the potential is not too great.