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474 WOXX13 KWNP 201240 ALTK04 Space Weather Message Code: ALTK04 Serial Number: 1705 Issue Time: 2014 Apr 20 1235 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2014 Apr 20 1235 UTC Synoptic Period: 1200-1500 UTC Active Warning: Yes Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. # Issued by the US Dept. of Commerce, NOAA, Space Weather Prediction Center # Recent messages, data, and help at http://swpc.noaa.gov/alerts/ # Send questions to SWPC.Webmaster@noaa.gov