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The CME associated with a filament eruption on August 12, 2015 arrived a little earlier than expected. An interplanetary shock was observed by the ACE spacecraft at approximately 0745 UTC (3:45 am ET) on August 15th. G3 (Strong) Geomagnetic Storm levels were reached by 1143 UTC (7:43 am ET), however, activity levels appear to be decreasing slightly as the initial phase of the impact passes. G2 (Moderate) Geomagnetic Storm conditions are still in progress as CME effects continue.
http://www.swpc.noaa.gov/news/g3-strong-geomagnetic-storm-levels-reached-early-cme-arrival
Shock Passage Detected / Geomagnetic Storm Warning
ALERT: Geomagnetic K-index of 7
http://www.solarham.net/
NOAA SPACE WEATHER SCALES
http://www.swpc.noaa.gov/noaa-scales-explanation
Image credit: NASA