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They didn't see that one coming

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 WhiteHorse    490

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2015 Aug 15 0745 UTC
Deviation: 36 nT
Station: Niemegk

UPDATE @ 12:15 UTC: To our surprise, a Strong (G3) Geomagnetic Storm is currently in progress at high latitudes. Sky watchers should be alert for visual aurora if it is still dark outside.

ALERT: Geomagnetic K-index of 7
Threshold Reached: 2015 Aug 15 1143 UTC
Synoptic Period: 0900-1200 UTC
Active Warning: Yes
NOAA Scale: G3 - Strong

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