There's a storm out in space and it's heading straight for us. On the 9th and 10th of September, a sunspot erupted and caused coronal mass ejections (CMEs): a huge release of matter and radiation from the Sun's corona.
Associated with the CME was an X-class flare (with X being the strongest out of classes A,B,C,M and X). While the flare arrived at Earth within a matter of minutes, the matter (CME) travels much slower and is due to arrive today.
Although the flare was strong, the CME is nothing too much to worry about. It will however mean more active aurora, so there's a good chance of Northern / Southern lights at moderate latitudes.
A pair of CMEs is heading for Earth. The two solar storm clouds were launched on Sept. 9th and 10th by strong explosions in the magnetic canopy of sunspot AR2158.