From spaceweather.com:
A series of coronal mass ejections (CMEs) en route to Earth from sunspot 1158 will buffet our planet's magnetic field during the next 24-48 hours. NOAA forecasters estimate a 45% chance of geomagnetic activity on Feb. 17th. High-latitude sky watchers should be alert for auroras.
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Radio Warnings
http://www.swpc.noaa.gov/alerts/warnings_timeline.html