https://spaceweather.com/
M-CLASS SOLAR FLARE: Earth orbiting satellites have just detected an M2-class solar flare from sunspot AR2964: movie. A pulse of X-rays ionized the top of Earth's atmosphere, causing a brief shortwave radio blackout over the Pacific Ocean. This flare is not expected to produce a significant CME. Solar flare alerts: SMS Text.
GEOMAGNETIC STORM WATCH (CATEGORY G2): A full-halo CME is heading directly for Earth. ETA: late on March 13th. Coronagraphs onboard the Solar and Heliospheric Observatory (SOHO) recorded the storm cloud leaving the sun earlier today: (This picture not included...to view go to link)
A new model of the CME from NASA pinpoints the arrival time around 1800 UT on March 13th. In this animation, the yellow dot is Earth: 
Note: The bright "star" at the lower right of the sun is Jupiter.
This CME is the result of a long duration C2-class solar flare near sunspot AR2962. Normally, C-class flares are not considered to be strong. However, this one lasted nearly 12 hours, allowing it to pump plenty of energy into the CME.
Moderately-strong G2-class geomagnetic storms are possible after the CME arrives. During such storms, naked-eye auroras may appear in northern-tier US states from Maine to Washington. Power grids and satellites will experience little to no effect, however.