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National Oceanic and Atmospheric Administration

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R1 (Minor) Radio Blackout Impacts
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HF Radio: Weak or minor degradation of HF radio communication on sunlit side, occasional loss of radio contact.
Navigation: Low-frequency navigation signals degraded for brief intervals.
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G1 (Minor) Geomagnetic Storm Levels Observed

G1 (Minor) Geomagnetic Storm Levels Observed
published: Saturday, August 19, 2017 18:21 UTC

G1 (Minor) geomagnetic storm levels were observed at 02:59 UTC on August 19 (10:59 pm Eastern) due to continued coronal hole high speed stream activity.  A G1 (Minor) warning is in effect until 09:00 UTC (05:00 am Eastern).