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Time of prediction: Friday, February 18, 2011 3:00 GMT*
Lead-time for prediction: 52 minutes
Forecast:Auroral activity will be high. Weather permitting, highly active auroral displays will be visible overhead from Inuvik, Yellowknife, Rankin and Igaluit to Juneau, Edmonton, Winnipeg, Thunder Bay and Sept-Iles, and visible low on the horizon from Seattle, Des Moines, Chicago, Cleveland, Boston, and Halifax.
IMPACT! A CME hit Earth's magnetic field at approximately 0100 UT on Feb. 18th (8:00 pm EST on Feb. 17th). The impact was not as strong as expected considering the cloud's probable X-class origin. Nevertheless, geomagnetic storms are possible in the hours ahead. High-latitude sky watchers should be alert for auroras.