From New Scientist:

The storms appeared during a dramatic, planet-wide disturbance on Jupiter that is ongoing. The cause of the disturbance has yet to be explained, but it has changed the colour of some of the planet’s stripes.

“It’s pretty clear that there’s a lot going on in Jupiter’s atmosphere right now – much more than usual – and these storms are probably tied in with that so-called global upheaval,” says co-author Imke de Pater of the University of California in Berkeley, US.

I blame SUVs. It’s either that or Monoliths.