Yesterday's M1-class eruption from sunspot 1261 was observed by three spacecraft: SOHO, STEREO-A and STEREO-B. Using data from those three points of view, analysts at the GSFC Space Weather Lab have made a 3-dimensional model of the CME now en route to Earth. Click HERE to launch a computer-generated movie of the expanding cloud:

Image
© SOHO, STEREO A & B
According to their work, the CME left the sun traveling 900 km/s and should reach Earth (denoted by a yellow dot in the simulation) on August 5th at 0300 UT plus or minus 7 hours. Another cloud produced by today's M-flare may be right behind it; stay tuned for movies of that one, too. Mild to moderate geomagnetic storms are possible when these CMEs arrive on August 5th and 6th.