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INCOMING CME: Sunspot AR1748 unleashed an M3-class solar flare on May 17th at 0858 UT: image. Although this is not the strongest flare we've seen from AR1748, it could be the most geoeffective. The explosion hurled a CME into space that is expected to hit Earth's magnetic field on May 19th. NOAA forecasters estimate a 75% chance of polar geomagnetic storms when the cloud arrives. The Solar and Heliospheric Observatory took this picture of the CME leaving